// Definition
A type of grow light using a ceramic arc tube that produces a broader, more natural spectrum than standard metal halide or HPS bulbs while generating significantly less heat. Operating at 315 watts versus 1,000W for traditional HPS, CDM bulbs offer substantial energy savings with comparable growing results and allow closer placement to the plant canopy without thermal stress.
// From the Episode
Brad Higgins advocated for CDM ceramic bulbs as next-generation lighting. Tony Verzura described seeing the bulb and ballast in person: “The ballast looks like a square box, really thin. There’s no heat with the bulb and there’s no heat with the ballast. It pulls 300 watts.” In Colorado, the electric company offered a 30% rebate on power bills for efficient lighting, making the switch economically attractive.