What do you use for a drop or work light?

I have a couple magnetic, but my favorite is an LED that installs into a standard trouble light. I found and attached a picture. Basically it replaces the guard on a standard trouble light and gets clamped in place so it doesn't come loose. Works like a standard trouble light with no heat of a normal trouble light. I've been using mine for a couple years now. Need to order a couple more.