Superior color quality. Crisp white light. Very High 1.95 PPF per second light source. 3100°K or 4200°K color temperature, High 92cri, 33,000 initial lumens (105Lm/W). High 90% lumen maintenance at 8,000 hr/High 85% PPF maintenance at 20,000 hr. Unique Open Rated Lamp construction reduces radiant heat from the arc tube and is suitable for open fixture use.