[wlesieutre]

60 lm/W is very low these days. Commercially available screw-base A21 bulbs like Cree's "100W replacement daylight" (17,000 lumens at 15W) are up over 110 lm/W. You can get that for $14 at Home Depot.

http://creebulb.com/100-watt-replacement-daylight

http://www.homedepot.com/p/Cree-100W-Equivalent-Daylight-500...