Almost a month ago I started trying to reverse engineer an inexpensive LED color changing light bulb. With your help I’ve mapped out the circuit, and taken control of the bulb. But there’s still a few ...

We’ve seen that Philips’ dimmable 12.5W 800 lm LED bulb emits light in the same spherical pattern we’ve come to expect from incandescent bulbs. How does it do this? First off, let’s refer back to the ...

The typical household LED light bulb is advertised with a 25,000 hour lifespan, which would be more than 20 years at 3 or so hours of use per day. That sounds great, but it seems that a good number of ...

LED headlights throw extremely intense light with very little draw on your car's electrical system. Now that they're trickling down to the aftermarket, you can buy a simple plug-in "LED retrofit kit" ...

If your old incandescent Ryobi flashlight bulb is dead, it's actually possible in most cases to swap it out for an LED.

They’re consistently popular with the readers, which is admittedly part of my (and EDN’s) motivation to continue doing them. But I personally also find them fascinating; inevitably I come across at ...