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post #23 of (permalink) Old 05-04-2012, 10:14 PM Thread Starter
Algae Grower
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Join Date: Mar 2012
Location: Verona Italy
Posts: 13
Ciao guys,
we calculate the consumption of the led light.

The image shows the working point of an LED (extract from Cree XP-G led datasheet). Each LED is powered by a constant current of 700mA. With this current, the voltage across an LED is equal (approximately) to 3.2 Volt.

The power consumed by each LED is given by:
P = I(current) x V(voltage) = 0.7(Ampere) x 3.2(Volt) = 2.24 Watt

The total power consumed by light is only:
Ptot = P x num.leds = 2.24 x 5 = 11.5 Watt

I leave you comments ...

Ciao ciao Christian
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