Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
Great LEDs. Really directional, so be sure you want these for spot lighting, not flood lighting. As with all LEDs make sure you have voltage and current regulated, or else you might burn them out! They seem quite resilient though. Bright, cheap enough and equivalent quality to some of the known brands.
Fast switching makes it ideal for 555 timer pulse driver to make one super bright and efficient light that can equal some lower quality Cree.
No Specs, so had to burn out a few to find limits. Definitely not for direct USB connection as will only last a few minutes before degredation.
I saw in other reviews that they looked like "recased" 5mm LEDs.. not true. Mine are perfectly clear through and through. Their is a bit of wasted side throw light and the main beam is about 5 degrees spread, so it is a very narrow focused spot. The color changes from cool white to bluish to greenish with voltage increase, then dies. So keep it in the whiter ranges.
Buy them. They're great value and with free shipping, you can't go wrong. Ideal voltage is 3.3-3.8v with about 9ma per volt from 3.0-4.2v. Higher voltages do not provide any benefits. It starts to get hot over 3.8v so you are just wasting power too.
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