Post by
Pescakl1 »
https://forums.nicoclub.com/pescakl1-u98038.html
Tue Oct 27, 2009 1:53 am
Leo, it mainly depends on the camera.
Most of them are not that good at night but the one kots bought seems to be pretty good.Like he said, it is a CCD camera and I believe they did not filter the camera in order to get some infrared waves, therefore being able to see with barely no light.
What you found is pretty nice, but as usual, inaccurate in their specs: They use 6 Cree XR-E high power leds which can be powered with 700mA each (therefore the 3W claim). At 700mA, they deliver about 200 lumens each, therefore the 1300 lumens claim.
But...
driving them at 700mA, they would have need big heatsinks to not burn them out and there are none of that on it, you will notice them right away (something like computer heatsinks about 2 inch by 1 inch for each of the leds).That means they drive them below 100mA no more in order not to use heatsink. Of course, below 100mA, they don't deliver 200 lumens each. Probably about 20-30.And lumens don't add, two 20 lumens leds don't give 40 in total but more in the 30-35 lumens zone.
So yes, it is really nice what they did, but they lie on their specs in order to boost their sales, but does anyone can notice if a led delivers 30 or 100 lumens without any instrumentation? For sure, I cannot. I just know because I know how high power leds work and their specs.
I am working on back up light with 3 high power leds, each led delivering about 150 lumens each, with a focusing lens in front of them, with a nice heatsink in order to light them for about 1 minute at a time, no more.We will see how it goes.