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
= P x num.leds = 2.24 x 5 = 11.5 Watt
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Ciao ciao Christian