Plusrite Brand 400W Clear Universal Burning Position Metal Halide ED-37 Lamp with Mogul Base, 4000K Cool White Color, and CRI=65. (diameter 4 5/8", length 11 1/2"). Metal Halide Ballast (ANSI Code M59)
25,000 Lumens
Color Temp. 4000K
Finish: Cool White
How many of these would i want for a...