Dont get me wrong I like the idea, but I use my light off and on to spot check, so having to wait 30 seconds for it to come up to brightness would be a nag on me. I mainly use my blinkmann xl light and xpg to look under the hood, up under a truck or incase of a bucket van, inside the back and side. Maybe 5 minutes a day, off and on. I do this for fun during my breaks when I head out to the shop to use the rest room. I like looking at that type of equipment and need lots of light.
I also used the blinkmann till I got the xpg for reading small print. I used my xpg half an hour the other day to read 2 chapters and the day before my blinkmann xl to read over an instruction sheet on an assignment and my print off of the work.