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post #1 of 5 (permalink) Old 04-03-2012, 09:25 AM Thread Starter
 
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amps to watts

I found a small cheap set od LED lights that would be great replacements for the stock lights. The problem is they only offer the amp draw and candle power, no wattage spec. Is there a way to convert the amp draw to wattage? The specs say the draw is .074 amps.



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post #2 of 5 (permalink) Old 04-03-2012, 09:58 AM
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Re: amps to watts

Power= intensity x electromotive force

Or In laymans terms

Wattage = amps x volts

Or divide amps or volts by watts to get the other
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post #3 of 5 (permalink) Old 04-03-2012, 05:32 PM
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Re: amps to watts

.074 amp x 12 volts = .888 watts. That's very low.
Most new high output LEDs are 1 watt, 3 watt, or 10 watt, with 100 watt on the way. The older LEDs are 1/2 watt. Thats probably what it has. Light output will be low. The stock PIAA lights, may be brighter.

Check the lumen output. Just for comparison a good LED flashlight, with 2 AA batteries, puts out 100 to 300 lumens, at 1 meter.

The Rigid Industries LED lights, I think are using 3 watt LEDs. Their Dually Light, puts out roughly 1300 lumens, with 4 LEDs. 1300/4 = 325 So they are getting about 300+ lumens per LED. There are a few watts use in the LED driver circuit and some of the power is changed to heat. Thats why they need cooling fins.
LEDs are not on all the time. The control circuit, turns the LED on and off many times a second. The faster they can do this, the more light output they can get. This technology is what drives up the price. High output = high price.

I hope this isn't to confusing and I know it can be. Just try to find the most output, to dollars, as you can.



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post #4 of 5 (permalink) Old 04-04-2012, 05:20 AM Thread Starter
 
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Re: amps to watts

Quote:
Originally Posted by Bear Foot View Post
.074 amp x 12 volts = .888 watts. That's very low.
Most new high output LEDs are 1 watt, 3 watt, or 10 watt, with 100 watt on the way. The older LEDs are 1/2 watt. Thats probably what it has. Light output will be low. The stock PIAA lights, may be brighter.

Check the lumen output. Just for comparison a good LED flashlight, with 2 AA batteries, puts out 100 to 300 lumens, at 1 meter.

The Rigid Industries LED lights, I think are using 3 watt LEDs. Their Dually Light, puts out roughly 1300 lumens, with 4 LEDs. 1300/4 = 325 So they are getting about 300+ lumens per LED. There are a few watts use in the LED driver circuit and some of the power is changed to heat. Thats why they need cooling fins.
LEDs are not on all the time. The control circuit, turns the LED on and off many times a second. The faster they can do this, the more light output they can get. This technology is what drives up the price. High output = high price.

I hope this isn't to confusing and I know it can be. Just try to find the most output, to dollars, as you can.
Thanks Bearfoot. I ran across these at the local autoparts store. I have 2 7" HIDs on the front and a single row Ridid light bar already. So the stock lights just sit there and cannot be used at all due to the wattage usage of the other lights. So I figured what the heck at least I can turn these on for a different look. I really want them so I can point them down at the ground in front of the car. I HATE when I pull up to the sharp side of a dune at night and cannot see what is down below. At the very least it will look better with the little cheapees lit up on the front of the car, not really relying on them for visibility.



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post #5 of 5 (permalink) Old 04-04-2012, 06:25 AM
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Re: amps to watts

Oh ya, they'd work great for that. Some of the rock crawling buggies have down lights.



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