CDM !
ceramic discharge metal-halide (CDM) lamp
The ballast runs on 220v, so the relay connects the 220v circuit when 110v is applied to the coil in the relay, this comes from a cord plugged into my timer.
The color spectrum of this bulb is supposed to be phenomenal, SO much better than CMH, runs on less current and puts out a lot less heat.... can't wait to get the girls under this !
Supposedly you dim the bulb via the ballast to 210W during the veg stage then back to full power for flowering.
This not only changes the brightness, but the color spectrum as well.
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