LED's are awesome! They have proven to be reliable and draw minimal power. The Dewalt DCL040 is the work light for the 20V line up. Last year we reviewed the DCL510 12V MAX flashlight and it brightened our day :}. The 110 Lumen 20V flashlight has 20 less lumens than the 12V DCL510. You can hardly notice the difference between the two and the 20V gets up to 11 hours on one charge with the optional 3.0 Ah battery. It works with both the 1.5 Ah or 3.0 Ah batteries. You can leave it on the entire workday without the need to swap out batteries. The light is very efficient.
The DCL040 looks like your typical pistol grip style light with a rotating LED head. The ergonomic over-molded rubber grip makes it comfortable to hold and the on off switch is where the trigger would be if it were a drill. The head is relatively compact and positively locks in 10 positions giving it a 120 degree pivot. Above the head is a ring that can be rotated up for hanging. You can use optional belt hooks on either side of the light, just like the drills. The light is very stable when sitting upright and weighs 1lb without a battery. As with all high power LED lights the head of the unit does get warm, but nothing compared to incandescent bulbs.
DeWALT's standard 3 year warranty covers this tool. The DeWALT DCL040 20V MAX Lithium Ion LED Work Light is rugged and has great run time. If you already have the 20V line of tools and need a light, the DCL040 is a no brainer! Even if you don't, it is a great work light.