SteveG wrote ...

Instead of using incandescent, why not use those screw in compact
flourescent.

I was in the hardware store today to pick up some window frames (in case you
cared) and was killing time reading the labels on those screw in cf's. The
temperature on all the ones that listed it (GE's, I think) was only 2700k!
That ain't enough spectrum to grow a plant.

kush