Cool 400W
Grow Lights400W
The Cool 400W is the small lamp in Sunmaster's COOL range, their vegetative line. It runs at 5,500K and Sunmaster publishes 480 µmol total, 430 of it between 400 and 700nm, for 110 PAR watts.
The spectrum is the reason to pick it: Sunmaster put 50% of the lamp's spectral energy in the blue/violet range between 380nm and 495nm, which is what keeps internodes tight and leaves broad rather than stretching a plant toward the light.
Rated life is 15,000 hours — the longest in the COOL range — and it burns in any position, so a vertical socket is fine. Part number 80309. Sunmaster intend it swapped for a flowering lamp when the cycle turns, not run right through.