Fastest incandescent lamp?
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Posted by Bill Bowden on November 20, 2005, 9:02 pm
Please log in for more thread options What type of low voltage incandescent would be best to use for fastest response time, or is there any difference? I'm looking for a approximate 2 watt low voltage lamp to use with a electronic roulette wheel. The pulse width is about 15 milliseconds when the wheel starts and gets wider from there as the wheel slows down. I tried using a 12 volt, 3 watt lamp with some bias to keep it warm but that didn't help much. The lamp is fairly dim on short short pulses with or without the bias. Is there any particular incandescent lamp that is better than others in terms of response time? -Bill | |||||||||||||||||||||||||||||||||||||
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Posted by Tim Williams on November 20, 2005, 11:18 pm
Please log in for more thread options For a given filament temperature (and thus life, intensity and color), there's a certain amount of mass (volume) behind the surface area emitting that light. Your best bet would be grain-of-wheat types, if smaller don't exist (grain of dust lights? LOL). Trivia: you can operate incandescents up to many kHz, but it's a small delta T (small delta intensity) at a high bias temperature (where heat loss is rapid = high thermal slew rate). Tim -- Deep Fryer: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms | |||||||||||||||||||||||||||||||||||||
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Posted by Bob Masta on November 21, 2005, 2:30 pm
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wrote: >What type of low voltage incandescent would be best to use for fastest
>response time, or is there any difference? > >I'm looking for a approximate 2 watt low voltage lamp to use with a >electronic roulette wheel. The pulse width is about 15 milliseconds >when the wheel starts and gets wider from there as the wheel slows >down. I tried using a 12 volt, 3 watt lamp with some bias to keep it >warm but that didn't help much. The lamp is fairly dim on short short >pulses with or without the bias. > >Is there any particular incandescent lamp that is better than others in >terms of response time? If response time is an issue, why not convert to LEDs? Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis www.daqarta.com Home of DaqGen, the FREEWARE signal generator | |||||||||||||||||||||||||||||||||||||
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Posted by Bill Bowden on November 21, 2005, 1:38 pm
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> If response time is an issue, why not convert to LEDs?
Yes, I thought of using white LEDs but I don't think a single LED would be bright enough and has a narrow viewing angle. Most of the light would go straight up to the ceiling. I suppose the Luxon star 1 watts might work, but are too expensive. Anyway, I picked up a couple 14 volt 120mA bulbs at Radio Shack today for $1.71. I'll give them a try and report back. They are cheap enough to run at higher voltage with a little less lifetime. Do you know what the reduced lifetime would be running at excessive voltage? -Bill | |||||||||||||||||||||||||||||||||||||
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Posted by John - kd5yi on November 21, 2005, 4:32 pm
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>> If response time is an issue, why not convert to LEDs?
>
> Yes, I thought of using white LEDs but I don't think a single LED would > be bright enough and has a narrow viewing angle. Most of the light > would go straight up to the ceiling. I suppose the Luxon star 1 watts > might work, but are too expensive. > > Anyway, I picked up a couple 14 volt 120mA bulbs at Radio Shack today > for $1.71. I'll give them a try and report back. They are cheap enough > to run at higher voltage with a little less lifetime. > > Do you know what the reduced lifetime would be running at excessive > voltage? > > -Bill Life expectancy is roughly inversely proportional to the applied voltage raised to the 12th power. So rumor has it. http://members.misty.com/don/bulb1.html Cheers, John | |||||||||||||||||||||||||||||||||||||
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> response time, or is there any difference?