WOW thanks alot, Ive been looking for this info.
The units i bought are 630Ma 3 W bridgelux.
I still plan to change the fans with a higher CFM silant fan.
630 MW means they are running at roughly 3.40 to 3.35 Volts.
Since Watts = Amps X Volts
0.63 Amps X 3.35 Volts = 2.11 Watts
0.63 Amps X 3.40 Volts = 2.14 Watts
Now if you looking at total power used by a fixture with an innefecient driver you could have roughly 1 Watt used by the driver for every 2 watts of lighting. So you could have a 60 LED fixture using 180 Watts of electricity at the wall but only 128 Watts are applied to the LED's themselves. Then you have a precentage of the LED power converted to heat and the rest converted to light.
This is why it is hard to judge fixtures other than with an unbiased testing source.
Different LED's have different heat to light ratios
Simular LED's oppereate differently at different power ranges.
Different drivers have different amounts of power that they consume
Different Fans use different amounts of power and create different levels of noise.
Different Optics cause different levels of reflection, refraction, and diffusion.
It is very possible to design and build two seperate LED systems that both use 120 Watts of power total. However with one using the most effecient design it could produce two or more times the actual light as the other unit.