kathy82

as far as the human eye the 940nm leds give off no visible spectrum, and the "experts" say the 940nm ir lenses dont see them as bright, and make a horrible ir light source and should only be used for remote controls. as for the 850nm ir wavelenth, the led lights up red so you will see it at night, my personal experience has taught me, that if your using ir for lighting effect ie. night vision, than throw the 850 wavelenth out, you can see it, it draws attention. i only use the 940 and can not tell the diffrence from 850 and 940 through my cameras they both look just as bright, in compairison. as for pricing i just bought from http://www.lightingnext.com/940nm-infrared-led-strip-light.html for 99 bucks