The bulbs (two 150w mounted above) I had used for so many years added about 500 foot-candles (according to my light meter) to the growing area. Which was just enough with the natural light coming in to bloom everyone there.

I am afraid I will have to start looking at other options like Metal Halide, which I had been happy to avoid for so long. I am hoping someone here had a good experience with a different brand of an incandescent grow light I could try.