Jfet wrote:
The lumen figure quoted for that $15 LED module is unrealistic.
The power consumption of the device from the description is 0.25 amps at 12.8V, or 3.2 watts. Even if you assume that the electronics are 100% efficient (impossible), that would mean they are getting 164 lumens per watt. They should apply for a Nobel prize.
A more realistic figure would be around 80 to 100 lumens per watt, and a efficiency of about 95% for the driver, giving a possible lumen output of around 300 lumens. The modules I am using consume double the power and are conservatively rated at 450 lumens each when inside the translucent housing(as you pointed out I am using two). They probably are more like 500 to 600 lumens with the clear bezel I got from camping world.
You must be a fellow electrical engineer. ;) Nice reply. Love to see logic prevail.
