2006-07-26 08:53:39 · 6 answers · asked by Donall 1 in Home & Garden ➔ Other - Home & Garden
Definitely LED. There are replacement lamps for car bulbs made of LEDs, and they have the resistor already built-in, so they run straight on 12VDC. And since they have "4 legs", you can choose between high brighness (about 65mA) or low brighness (about 15mA). They don't come very cheap (yet), but consider this: They are guaranteed to "live" for at least 30 years!
One possible source:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=349735&Site=US&Cat=34669442
2006-07-26 09:19:53 · answer #1 · answered by Marianna 6 · 0⤊ 0⤋
newly-wed's calculation ingredients the efficient resistance of the one hundred fifty watt bulb, yet no longer the resistance required to offer 0.5 the means. If the means is decreased to seventy 5 watts, then the present flowing is seventy 5/12 = 6.25 amps and the completed resistance is 12/6.25 = a million.9 ohms. In theory you subtract 0.ninety six ohms for the bulb to get the cost for the exterior resistance, yet in prepare the resistance of the bulb at 0.5 means is fairly below at finished means, so the parent is only approximate. The exterior resistor will nevertheless be dissipating 30-40 watts and needs to be wisely diverse (e.g. 60 W). it is an rather inefficient way of reducing the lamp means. it is greater helpful to apply some electronics to drop the voltage.
2016-12-10 16:10:19 · answer #2 · answered by ? 4 · 0⤊ 0⤋
u can always try leds, but U need a resistor with them too, but the leds r about 5p, and the resistors r about 30p 470 ohm resistor should do
2006-07-26 09:07:15 · answer #3 · answered by caprilover79 3 · 0⤊ 0⤋
Wot solarsystem are we on about? The Milky Way?
2006-07-28 08:19:19 · answer #4 · answered by wiz 4 · 0⤊ 0⤋
try car light bulbs.
2006-07-26 09:00:40 · answer #5 · answered by yiannis the greek 4 · 0⤊ 0⤋
Look in D.I.Y. shops.
2006-07-29 08:58:03 · answer #6 · answered by Ollie 7 · 0⤊ 0⤋