I work in auto repair and deal with lighting-I call the shop "the dungeon" and have found that LED's can be effective for spot lighting, but really suck at lighting large areas. The tool trucks are selling drop lights that are advertised as being the =13W c.f. but aren't nearly as effective and cost several times as much. I use a 42W c.f- yes 42 W..advertised=150W incandescent for general underhood lighting and it is BRIGHT! I have a flashlight with 6 LEDs for spot work-underdashes and in doors,ect and it's great...use the right tool for the job. If you feel ambitious go for it-I'd try mounting the LEDs on an highly directional reflector-like the AH supply units.