Phillips Mastercolor LEC 315 Lamp Superior color quality. Crisp white light. Very High 1.95 PPF per second light source. 3100k 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. Ceramic Metal Halide lamp for HPS ballasts.