Philips CDM CMh LampsSuperior color quality. Crisp white light. 4200K color temperature, High 92 CRI, 34,300 initial lumens (109 lm W). High 90% lumen maintenance at 8,000 hr. High 85% PPF maintenance at 20,000 hrs. Unique open rated lamp construction reduces radiant heat from the arc tube and is suitable for open fixture use. Painted tip lamp works great with GreenBeams reflectors. Important: Until the lamp has achieved a least 10 hours of operation, the lamp should