When I worked for my dad doing electrical work, my favorite lights were the 3 watt l.e.d. Maglite, P.T. EOS or Quad headlights, and the Gerber LX3.0 (that thing is impossible to break, even if you try to). I stopped carrying a lot of lights and my best lights to work after someone stole my backpack full of my best lights, knives, and tools at the jobsite (the guy wasn't one of the workers and snuck in looking for something to steal). Work lights should be those that are built tough, but easily replaceable. You never know when your light will be dropped by a coworker, run over by a car, dropped in a dirty toilet, or stolen. Don't carry lights on the jobsite unless they are locked up or carried on you. A hundred dollar light is too easy to steal at a jobsite, especially the ones small enough to hide in a pocket. While I generally trust my coworkers, for those that make $10 or less an hour, it's tempting to steal something expensive and pawn it for money. I'd rather not give them the temptation.