Philips Master Color 942 CDM Elite MW, 315 Watt, 4200K. T-12Superior 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. Important: Until the lamp has achieved a least 10 hours of operation, the lamp should never be turned off sooner than 2 minutes, including during