Growers Choice brings us the industries first true 630W Double Ended Ceramic Metal Halide Grow Lamp. This lamp had precision gasses for enhanced spectral output, and generates less heat than HPS and MH. This lamp also matches sunlight very closely compared to many other lighting solutions available. Use with a 1000w high frequency digital ballast dimmed down to 600w. These bulbs are not compatible with Gavita 6/750w DE Complete Fixtures. Recommended operation in a 1000W ballast dimming it down to 600W. Never run them under 1000W setting. Contains precision gasses for enhanced spectral output. Generates much less heat than HPS and MH. More closely matches sunlight than ANY other lighting solution available. Growers report tighter inter-nodal spacing and better yields on flowering plants. Suggested Ballast Operation Best operating frequency would be a low frequency square wave of 110 Hz or High frequency 150KHz Using a 1000W Ballast and dimming down to 600W will also work effectively with this lamp (not compatible with SolisTek 600W ballast) Lamp Performance Type: DE-CMH Initial Par: 1135 umol/s Photon Flux: 1150 umol/s Light output (Lumens @ 100 Hours) 65000 Lumens Lumen per Watt: 105 Rated Life ( Hours @ 10 Hour/Start): 10000 Lamp Operating Amps: 3.0A Min-Max Starting Pulse: 5-6 Peak KV Min Open Circuit Voltage: 342V RMS Min Pulse Width: 1 @4500V (microseconds) Min Pulse Rate per 1/2 Cycle: 1 Pulse position: 90-90, 240-270 electrical degrees Wattage: 630W Lamp Operating Voltage: 200V CRI: 97 Color Temperature: 4200K Burn Position: Horizontal +/- 15 degrees Physical Data Requirements Max Base Temp: 250C Max Bulb Temp: 700C Luminaire Type: Open/Enclosed