Related to earlier discussions of interior lighting:

Incandescents produce about 16 lumens per watt
LEDs produce abot 30 to 35 lumens per watt, although they vary, but are
becoming more efficient
Fluorescents produce about 80 lumens per watt.

http://nemesis.lonestar.org/reference/electricity/fluorescent/efficiency.html

http://members.misty.com/don/lede.html

Not the best sites to sort through for the facts, but there are many sites
out there that will list the efficiency of these bulbs.

Ed in CT