I purchased one of the LED flood lights from Amazon:
OK, I guess I should mention the really stupid thing I did to the first one. You will note that this is a 12V light. The box said 120V. It had been weeks between buying it and hooking it up so I forgot and just assumed the box was right. BANG. Breaker tripped and light destroyed.
So I bought another. I hooked it up to my variable power supply and started with 0V. As I headed toward 12V, it came on at about 5.5 and I didn’t really notice much difference in brightness as I got up to 12V (then again it is so bright I simply might not have noticed).
It works great and produces a little more light than a 60W bulb @12V and .8A.
I had a 9V battery sitting on the table. Hmmm, will it work I wondered. Sure does!! A 9V battery isn’t going to power it very long, but it was cool to see a battery that small produce that much light!