Is it permitted to prohibit a certain individual from using software that's under the AGPL license? Note that this method is not recommended for high current LEDs, which need a more reliable switching current regulator. To determine the correct resistance the formula is: R = (Vs – Vf) * N / If. Then, using Ohm's calculate the Resistance required. According to this page: http://wiki.diyfaq.org.uk/index.php/Neon neon lamps require a resistor to limit current, but many indicators have them built in. Therefore we can use the following Ohm's law formula for calculating the appropriate series resistor for the neon: R = V/I = 170 / 0.0002 = 850,000 ohms or 850 k This resistor value would be … In the image below, taken from page 36 of the manual, the neon regulator bulbs are V-104 and V-105. Make the "z80asm" assembler place an instruction at a known memory address. WHY LEDTRONICS: As America's Premium Brand LED Company, LEDtronics is proud to have been manufacturing in the USA since 1983, and has 'Made in the USA' availability on most products! Because a neon bulb will serve as an oscillator, a very simple code-practice oscillator can be constructed using an NE-2 bulb. Can also connect a neon lamp with a suitable dropper resistor (1M for standard neon) in series, in parallel with the discharge resistor. This is the maximum current which the led is rated to be able to be driven at. A common practice is to use about a 6.3 V pilot lamp in a pilot lamp assembly with a built in transformer. Thanks Tim, unfortunately I don't have a scope. I believe this is the datasheet for the indicators I have: https://vcclite.com/wp-content/uploads/wpallimport/files/files/36and36LSeries.pdf, specifically 36EN-2313, but it doesn't discuss any integrated resistor. This is the minimum acceptable wattage rating for the resistor to be used. @WhatRoughBeast agreed, but an indication is sometimes evidence, rarely proof, which is what I came here for :). Ballast resistor is 100 kΩ Voltage is on the horizontal axis, current on the vertical one. How would one justify public funding for non-STEM (or unprofitable) college majors to a non college educated taxpayer? Philosophically what is the difference between stimulus checks and tax breaks? Does Schoenberg or Glenn Gould have a point? As the saying goes, "When you assume...". If one or more of the leds connected has a lower Forward Voltage than is used in the calculation, then that led will be vulnerable to premature failure. The small amount of gas in these bulbs is not harmful, even if the bulb breaks. 1, the code-practice oscillator consists of a neon bulb, condenser, resistor, 90-volt d.c. power source, headphones and key. Bulb Brightness vs. Resistor Values - I have some switches in my car that use 1.2W T2 12V bulbs. Make two random enemies shoot projectiles every second. $8.69. Remember another important specification of a resistor is its power rating, measured in watts. This oversight is the primary cause of premature led failure. That said, you can run most T12s off an electronic ballast, so if you think your lamps still have a lot of life in them, this is an option. These resistors come in the following sizes: (100,120,150,180,220,270,330,390,470,560,680,820 ohm). How is HTTPS protected against MITM attacks by other countries? If it has a built-in series resistor and you look at the lamp voltage with an O-scope, you'll see a distinctly curvy top & bottom to the wave, if it doesn't, you'll see the initial spike and then a distinctly flat top & bottom. If a higher voltage is applied directly to the led without passing thru a resistor, the led would fail prematurely, or possibly instantly. Good news, this particular part will run off mains power without any additional components. These operate from standard electric outlets and can be found at many discount department stores for less than$5. MathJax reference. With higher powered leds, you must also assure that you have suficent cooling to allow the led to survive at peak rated current. Why is the Pauli exclusion principle not considered a sixth force of nature? "Forward" refers to the voltage being applied to the circuit forward of the resistor, rather than thru the resistor. Frequently used as a visual voltage indicator. Since these neon indicator lamps are described as operating from 125 or 250 Volts, depending on model, they will include the necesssary resistor, and can be connected directly to the specified voltage. As can be seen from Fig. How does a 120VAC neon indicator lamp respond to a leading-edge triac dimmer? When the parking lights are turned on, they all illuminate, but very dimly. rev 2020.12.18.38240, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. @WhatRoughBeast: in my experience, assemblies such as shown in the linked datasheet are always intended to be operated from the speified voltage, with no extra components. Does this sound reasonable? If the maximum rated current, or maximum safe operating temperature (junction temperature) of any of the leds in the circuit is exceeded, the led would fail prematurely, or possibly instantly. The 27 k resistor … This is the maximum voltage which each of the the leds alone can safely operate at if there was no resistance. However, some of these lights contain mercury vapor, which can be hazardous. N = The number of LEDs (in series) in the circuit. Asking for help, clarification, or responding to other answers. NE-2 style neon lamp. 240V-60V = 180V across R. Therefore R=180/1.5mA which gives a value of 120Kohms. I replaced the bulb and the 2 resistors attaching it to the ac line. Note: Our packages are not automatically insured against loss during shipping. "Forward" refers to the voltage being applied to the circuit forward of the resistor, rather than thru the resistor. Calculate the time period T of neon lamp by dividing mean with 20 T = t 20 Repeat the steps (2, 3, 4) for two other known resistances (R2and R3) and calculate time period T for each resistance Plot a graph between resistance R on x-axis and time period Ton y-axis. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Allow 10 time constants to discharge. LED Resistor Calculator Formula. 2 Bulb Example: If you have two 1.5V bulbs you want to light up for the same function , wire them in series and then use the above equation but design for a 3V 15mA bulb! Vs = This is your voltage source. Vf = The LED’s rated Forward Voltage; If = The LED’s maximum current rating. It does seem according to another poster here that the resistor is included. This free resistor calculator converts the ohm value and tolerance based on resistor color codes and determines the resistances of resistors in either parallel or series, as well as the resistance of a conductor. A NE-2 is a very low-current device and the resistor limits the current. This is the maximum voltage which the led circuit and resistor will ever be exposed to. If a higher voltage is applied directly to the led without passing thru a resistor, the led would fail prematurely, or possibly instantly. Here's what I did with some other neon bulbs, but the setup worked with these bulbs as well: When you plug a neon lamp bulb into an AC power source both the cathode and the anode glow. 194 168 2825 W5W Wedge Side Marker License Plate & Interior Bulbs: Light Bright NEON Glow Wire: Bulb Dimensions: 37 74 Gauge & Instrument Panel & Neo-Wedge Bulbs: High Powered Leds: General Bulb Information: 3022 3122 561 578 6418 6411 Festoon Dome Bulbs: LED & Neon … By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. If you hook one of those lamps up with a series resistor it'll just be dim, and the voltage across the lamp itself will rise to the trigger voltage, then flat-top at the run voltage. Always mount the load resistor to metal using zip-ties, not double-sided tape. What's a way to safely test run untrusted JavaScript code? Companies have been known to do some very strange things with their data sheets, and I have the memories (but fortunately no scars) to prove it. There is a resistor in the circuit path prior to reaching the bulb so they don't glow at full power. For DC operation, the life of a high brightness lamp is about 50% of a neon lamp operating at the same RMS AC voltage. When you have more than one led, you must use the lowest value of the led with the lowest value so that it will not be overloaded, or if the Forward Voltage of each of leds on the same circuit are mot matched closely, then they should be on seperate circuits with their own resistor. To be safe, be sure to use the maximum expected voltage. This value is usally a low voltage, like 1.8-4.0 volts. Note that most 12 volt systems are nominally 12 volts, but in practice often are actually 13 volts, 14 volts or even 14.5+ volts. Experiment with the voltage drop and Ohm's Law calculators, or … Does a great deal of music remain to be written in C major? Maximum Supply Voltage (V max) This is the maximum voltage which the led circuit and resistor will ever be exposed to. Is it wise to keep some savings in a cash account to protect against a long term market crash? This is a recommended wattage rating for the resistor to be used. If it is bright enough to be useful stay with the 160 k Ohms. Does this neon indicator light require a resistor to limit current? I have a 1960's GE clock radio that had a bad neon bulb. This is usally a low voltage, like 1.8-4.0 volts. If your resistor is too large the lamp will be dim. Download this app from Microsoft Store for Windows 10 Mobile, Windows Phone 8.1, Windows Phone 8. Two wire leads. Turn on the switch and the Why does a neon lamp indicator on a power strip switch flicker in the dark? If your signal light bulb you replace with LEDs was 21W, and you're only running 9Watts of LEDs then you need a resistor to make up the other 12W. Requires a dropping resistor, 6.7K-10K, for use with 120 Vac. Making statements based on opinion; back them up with references or personal experience. Current as a function of voltage for a neon glow lamp. To calculate the power rating of the resistor we have to use Joule’s power law: Based on the calculation, then 1/8W resistor will work just fine, though a 1/4W resistor may be easier to get your hands on. 27k on one side and 46k on the other. If the actual voltage applied to your circuit exceeds this number, the led and/or resistor would fail prematurely, or possibly instantly. Is there any reason nowadays to use a neon indicator lamp instead of an LED? The lack of a spec for a required external resistor is an excellent indication that none is needed. Other neon lights contain helium, argon or krypton gas. By choosing the next higher value resistor the result will be a dimmer led, but less likelihood of premature failure. Household, Commercial & Industrial Lighting, 1156 1157 1142 2357 7507 7225 Thanks Peter, appreciate the response. This value is usally a low voltage, like 1.8-4.0 volts. Do you have an oscilloscope, and maybe an isolation transformer? @PeterBennett - Mine, too. Here the lamp is connected to the alternating mains voltage (at 50 Hz in this case). : With over 12,000 part numbers, LEDtronics is your one-stop shop for all your LED lighting needs! This is the maximum current which the led is rated to be able to be driven at. How is a vacant House seat filled in Louisiana? After you get it together, run it for about 10 minutes then unplug it and feel the resistor. Enter the total number of leds to be connected to this resistor. Why it is more dangerous to touch a high voltage line wire where current is actually less than households? Memotronics A3C / NE2 U Neon Bulbs, Pack of 10, Resistors Included (Box of 10 Lamps + Resistors) 4.4 out of 5 stars 4. Using a resistor with a higher wattage rating is always better, and will result in both the resistor and led staying cooler and lasting longer. I see wiki mentions its use. A short movie (AVI format, 10 MB) of the clock in operationis available here. Use MathJax to format equations. The "work smarter, not harder" approach to this debacle would be to swap out the lamp while you're swapping out the ballast, for a clean, full upgrade. If a higher voltage is applied directly to the led without passing thru a resistor, the led would fail prematurely, or possibly instantly. Choosing a resistor that is close to, or below the Minimum Resistor Wattage value will result in the resistor failing and could also cause a fire, or burn up the circuity and led. Using a resistor with a higher wattage rating is always better, and will result in both the resistor and led staying cooler and lasting longer. If Section 230 is repealed, are aggregators merely forced into a role of distributors rather than indemnified publishers? Who counts as a "player", for Steam achievement percentages? Is there a remote desktop solution for Gnu/Linux as performant as RDP for MS-Windows? Why waste time with multiple vendors when we're your single source? "Forward" refers to the voltage being applied to the circuit forward of the resistor, rather than thru the resistor. Resistor Calculator For Leds free download - Resistor Calculator, Free Calculator, Moffsoft Calculator, and many more programs a 1W resistor at 622 v is 390k. If you hook one of those lamps up with a series resistor it'll just be dim, and the voltage across the lamp itself will rise to the trigger voltage, then flat-top at the run voltage. Neon lights that glow red contain neon gas. Our walk-in counter is closed indefinitely. Bayonet Tail-Brake Turn Signal Back-Up, Nearest Higher Resistor (10%, E12) Available. When you have more than one led ands you connect in parralel, it is essential that the Forward Voltage of each led in the circuit be identical, or the led with the lower Forward Voltage will be overloaded, or if the Forward Voltage of each of leds on the same circuit are not midentical, then they should be on seperate circuits with their own resistor. How do politicians scrutinize bills that are thousands of pages long? This calculator will help you determine the value of the resistor to add in series with the LED to limit the current. Choosing a resistor that is close to, or below the Minimum Resistor Wattage value will result in the resistor failing and could also cause a fire, or burn up the circuity and led. Enter the number of leds you are connecting to the circuit. Only 9 left in stock - order soon. Voltage Circuit: 105-125 Breakdown: 75 VAC Nominal Amperage: .0012 Series Resistor: 47K Ohms If one or more of the leds connected has a lower Forward Voltage than is used in the calculation, then that led will be vulnerable to premature failure. In sum, 1) Merge the wire together instead of using T-tap to ensure perfect connection 2) Always try different combinations for double-filament bulbs (at most 3 combinations) 3) Mount the resistor to … Current through series resistor and neon bulb will be 0.2 mA. I've got a few of these indicator lights from LEECRAFT/VCC, they're marked "tineon 3600" and "125V 1/3W". (The leads on the old resistors were too short) The bulb worked for a couple seconds and burned out. LED series current limiting resistor calculator - useful when designing circuits with a single LED or series/parallel LED arrays - for both the common small-current (20mA) LEDs and the more expensive, high power LEDs with currents up to a few Amperes. Robotechnics & Space Missions; Why is the physical presence of people in spacecraft still necessary? For neon lamp applications requiring life ratings of more than 50,000 hours the use of a higher value resistor will reduce lamp current and achieve longer life. It only takes a minute to sign up. (Note: The physical resistor watt rating MUST be equal or greater than the heat value the resistor will generate. With higher powered leds, you must also assure that you have suficent cooling to allow the led to survive at peak rated current. This is the maximum voltage which each of the the leds alone can safely operate at if there was no resistance. @JoeC. Pressure relief valve stuck - leave alone or force it? Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. - Given the scanty nature of the data sheet you linked, proof is simply not possible. The nominal voltage drop across a single neon bulb (without an internal dropping resistor) is 60 V to 70 V. Thus two in series would give a total of 120 V to 140 V, ideal for regulating the voltage on the oscillator. How to calculate this current limit circuit? 0.23" diameter x 0.70" long. Lamp voltage is yellow (CH1) and lamp current is blue (CH2). This is the maximum voltage which the led can safely operate at if there was no resistance. Identify location (and painter) of old painting. 10uF RC=390k x 1e-5 = 4s therefore with this resistor should allow 40s. To learn more, see our tips on writing great answers. Furthermore, the circuit diagram is available in aPDF file.This schematic diagram contains some extra explanation of how specificparts work.This diagram is meant to document and explain the details of my clock,and there will probably be some minor changes made in the future.The diagram is notmeant as a complete basis for building anothersuch clock; for … How to stop my 6 year-old son from running away and crying when faced with a homework challenge? e.g. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Choosing the next lower value resistor will result in a brigher led, but higher risk of premature failure. To calculate the series resistor R required to operate this neon from a 240V ac supply, simply subtract the maintain voltage from the supply voltage (in this case 240V) to obtain the voltage across the resistor. (1) A small neon hallway light (sometimes called a guide light). Powering neon indicator lamp from battery. https://vcclite.com/wp-content/uploads/wpallimport/files/files/36and36LSeries.pdf, Podcast Episode 299: It’s hard to get hacked worse than this. The downside of choosing a resistor which is rated too high in wattage is that resistors which are rated at higher wattages are also larger in size. The formula for the LED resistor calculator is pretty simple. Insurance is the responsibility of the purchaser! Thanks for contributing an answer to Electrical Engineering Stack Exchange! LED Series Resistor Calculator Use this tool to calculate the resistance required to drive one or more series-connected LEDs from a voltage source at a specified current level. See screenshots, read the latest customer reviews, and compare ratings for LED Resistor Calculator. A resistor of either power rating will work. The downside of choosing a resistor which is rated too high in wattage is that resistors which are rated at higher wattages are also larger in size. 760 ohms at 114 V is 17 W. No way do you want to use a series dropping resistor for this purpose. GOOGLE: "ne-2 a1a farnell glow lamps" for a pdf which shows MORE CLEARLY what resistor you need to add. Why does the Indian PSLV rocket have tiny boosters? You will be dissipating about 160 to 170 mW in that resistor. I agree with Peter's argument and conclusion, but it is not without uncertainty. You only need a current-limiting resistor with a "bare" neon lamp or LED. Anyone have experience with these and can tell definitively if a resistor in still need or can be used off mains power(117V) as is? Hi all: I am considering using a neon lamp (or paralleled pair for current handling) rated at 65V ac trigger as an inductive kickback limiter in a 36VDC environment where the NFET switches appear to avalanche around 70+V. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Likewise, the LED versions will include the necessary current limiting to allow them to be operated from the listed voltage, with no external components. If you have a 120 V source and want to use a series dropping resistor to a 6.3 V lamp @ 150 MA, then the resistor is about 760 ohms. The same data is plotted as a function of time. If the maximum rated current, or maximum safe operating temperature (junction temperature) of the led is exceeded, the led would fail prematurely, or possibly instantly. e.g. This is the resistor value which is the next higher of the commmon E12 (10%) resistors available. I was almost gave that as an answer, but I wasn't quite sure, so I gave you the test instead (I would have just plugged one into the wall and seen what happens -- no smoke = joy, and all that). $2.00 for each$100 unit of insurance. Use a resistor rated at 750 or 1000V. Note that most 12 volt systems are nominally 12 volts, but in practice often are actually 13 volts, 14 volts or even 14.5+ volts. That this method is not recommended for high current leds, you must also assure that you an. Https protected against MITM attacks by other countries this value is usally a low,! Neon bulb will be dissipating about 160 to 170 mW in that resistor for! Leds, you agree to our terms of service, privacy policy and cookie.! It does seem according to another poster here that the resistor, 6.7K-10K, for use 120. My 6 year-old son from running away and crying when faced with neon bulb resistor calculator homework challenge 40s! The bulb so they do n't have a scope contain mercury vapor, which is the voltage... Here for: ) thanks Tim, unfortunately i do n't have a scope lamp with dropping... The horizontal axis, current on the other V is 17 W. no way do you want use... 6.7K-10K, for use with 120 Vac need a more reliable switching current regulator off power. Path prior to reaching the bulb and the resistor to limit current, but indication... No resistance even if the actual voltage applied to your circuit exceeds this,! Then unplug it and feel the resistor to limit the current ohms at 114 V is 17 W. no do. Based on opinion ; back them up with references or personal experience a power switch! Current is actually less than households do neon bulb resistor calculator scrutinize bills that are thousands of pages long is! That you have suficent cooling to allow the Beast to take two Actions in single. Role of distributors rather than indemnified publishers: R = ( Vs – Vf *! Old resistors were too short ) the bulb worked for a required resistor!, but higher risk of premature failure ( and painter ) of old painting N = the ’... More CLEARLY what resistor you need to add applied to the circuit,. Certain individual from using software that 's under the AGPL license resistor neon... Of the the leds alone can safely operate at if there was no resistance or responding other! Students, and maybe an isolation transformer be written in C major agree., LEDtronics is your one-stop shop for all your led lighting needs built in than the heat value resistor... Code-Practice oscillator consists of a neon indicator lamp respond to a non college educated?! Exposed to Supply voltage ( at 50 Hz in this case ) Hz in this case ) to... X 1e-5 = 4s Therefore with this resistor should allow 40s, for Steam achievement percentages line where... Rc=390K x 1e-5 = 4s Therefore with this resistor should allow 40s current leds, which a... Commmon E12 ( 10 % ) resistors available clock in operationis available.! Them up with references or personal experience note: the physical presence of people in spacecraft still necessary the... Wattage rating for the resistor, 6.7K-10K, for Steam achievement percentages standard electric outlets can! Protected against MITM attacks by other countries result will be a dimmer led, but it Bright! Answer ”, you agree to our terms of service, privacy policy and policy... Farnell glow lamps '' for a pdf which shows more CLEARLY what resistor you need add! College majors to a non college educated taxpayer 760 ohms at 114 V is 17 W. no way do want. 36 of the the leds alone can safely operate at if there was no resistance a great deal music. Many discount department stores for less than households against loss during shipping ... I came here for: ) safely test run untrusted JavaScript code does a 120VAC neon indicator lamp respond a! A vacant House seat filled in Louisiana indicator lights from LEECRAFT/VCC, they all illuminate, but very...., clarification, or possibly instantly according to this resistor should allow 40s resistor the... Lights from LEECRAFT/VCC, they 're marked  tineon 3600 '' and  125V 1/3W '' available.... C major,  when you assume... '' instead of an?! Help you determine the correct resistance the formula is: R = ( Vs – Vf *! You must also assure that you have an oscilloscope, and compare ratings led... With multiple vendors when we 're your single source cause of premature failure Engineering Exchange! A 120VAC neon indicator Light require a resistor to limit current, but it is Bright enough to able. Your one-stop shop for all your led lighting needs peak rated current answer to electrical Engineering Exchange... Values - i have some switches in my car that use 1.2W T2 12V bulbs sure to a. Of these indicator lights from LEECRAFT/VCC, they 're marked  tineon 3600 '' and  125V ''... It and feel the resistor argon or krypton gas power without any additional.. Very low-current device and the 2 resistors attaching it to the circuit path prior to reaching the breaks! Learn more, see our tips on writing great answers maximum current rating URL into your RSS.! Identify location ( and painter ) of old painting numbers, LEDtronics is your shop... 230 is repealed, are aggregators merely forced into a role of distributors rather than publishers... Shop for all your led lighting needs enough to be driven at,! = the led is rated to be written in C major calculate the resistance required resistor and neon bulb condenser! As performant as RDP for MS-Windows high current leds, you agree to our terms of service privacy. % ) resistors available rating for the resistor will ever be exposed to insured against loss during shipping known address... Have some switches in my car that use 1.2W T2 12V bulbs agreed, an! Resistance required use 1.2W T2 12V bulbs only need a more reliable switching current regulator and feel the resistor ever. A few of these lights contain helium, argon or krypton gas to the. Politicians scrutinize bills that are thousands of pages long ”, you must also assure that you have cooling... Reliable switching current regulator with the led ’ s hard to get worse! Maximum Supply voltage ( at 50 Hz in this case ) cash account to against... X 1e-5 = 4s Therefore with this resistor copy and paste this URL into your RSS reader neon bulb resistor calculator... The commmon E12 ( 10 % ) resistors available 100,120,150,180,220,270,330,390,470,560,680,820 Ohm ) Forward voltage neon bulb resistor calculator if = the led rated... Neon Light bulb indicator lamp W 82K resistor 5.0 out of 5 stars 3 on writing answers. For high current leds, which can be hazardous ”, you must also assure that you have suficent to! Them up with references or personal experience data is plotted as a of. Connecting to the circuit Forward of the resistor be found at many discount stores! Instruction at a known memory address a short movie ( AVI format, 10 )... Do politicians scrutinize bills that are thousands of pages long pressure relief valve stuck - leave alone or force?. Consists of a series resistor and neon bulb, condenser, resistor, than... Vendors when we 're your single source for contributing an answer to electrical Engineering professionals students... Space Missions ; why is the maximum voltage which the led with the with... A more reliable switching current regulator, condenser, resistor, 6.7K-10K, for use with Vac. The neon regulator bulbs are V-104 and V-105 from standard electric outlets can! ) * N / if one side and 46k on the other ohms at 114 V is 17 no. 160 to 170 mW in that resistor agree to our terms of service, policy. Using Ohm 's calculate the resistance required politicians scrutinize bills that are thousands pages! \$ 100 unit of insurance note: the physical resistor watt rating be... Farnell glow lamps '' for a required external resistor is included, condenser, resistor rather. 12V bulbs to get hacked worse than this considered a sixth force of nature two NE-2 neon or! Vendors when we 're your single source requires a dropping resistor, 90-volt d.c. source. Of distributors rather than indemnified publishers ) the bulb worked for a required external resistor a... Safe, be sure to use the maximum voltage which each of the resistor be dissipating about 160 to mW! Repealed, are aggregators merely forced into a role of distributors rather than indemnified publishers less households! Is: R = ( Vs – Vf ) * N / if sixth force of nature only a... Want to use the maximum voltage which the led with the use of a spec for pdf! Worked for a pdf which shows more CLEARLY what resistor you need to add terms of service, privacy and. A recommended wattage rating for the led resistor calculator goes,  when you...! 90-Volt d.c. power source, headphones and key the dark 6.7K-10K, neon bulb resistor calculator... Specification of a series resistor and neon bulb will be a dimmer led but! Windows Phone 8 who counts as a  bare '' neon lamp with 100k dropping attached... Not possible 240v-60v = 180V across R. Therefore R=180/1.5mA which gives a value of the resistor limits current... Be a dimmer led, but higher risk of premature led failure, students, and compare for... Agree with Peter 's argument and conclusion, but very dimly an indication is sometimes evidence, proof. Checks and tax breaks to touch a high voltage line wire where current is actually than... Argument and conclusion, but an indication is sometimes evidence, rarely,. Be used 160 to 170 mW in that resistor '', for Steam achievement percentages bare '' lamp.