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But wait - there"s more White Led Below
Which would be more efficient the a normal 100W ind. bulb or white Led?
i am trying to compare a 100W bulb with 'n' (would like to know how many LED's) number of white LED's with 25mA - 4Volts each giving out equal brightness as the 100W bulb on a 220V.How much current would the bulb consume?
It depends on the particular LED... Also, one of the big problems with LEDs is that they give out very monochromatic light - basically all of the light is in a single (or a few) very tight frequencies, and it doesn't tend to look as good.
LEDs peak at around 100 Lumens / Watt. Regular light bulbs get around 15 Lumens / Watt.
Figuring 100W bulb = 1500 lumens... / 100 = 15W of LED.
Your LEDs are 25mA * 4v = .1w each, so you'd need 150 of them to equal a 100W light bulb.
--
To counter the guy above me... You can actually run strings of LEDs on AC if you use a capacitor to limit the current and you have to have enough LEDs in series to make the voltage drop across the chain not blow out the individual LEDs. I believe they use this when they make LED christmas lights.
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