Ardley Bridge has four double tube 48" ballasts, the plain metal shop style from the DIY store. The eight bulbs are GE F40C50 Chroma 50. Bulbs cost about $6. Each bulb emits 2200 lumens at 5K. My baseboard is 2.5 by 16 feet long or 40 square feet. 8 bulbs at 2200 lumens gives me 17,600 lumens. That's 440 lumens per square foot....
These photos show 3 of the four ballasts installed. I didn’t like the dark corners so another ballast was purchased and installed. Of course that meant all the lights had to be shifted...
