Unrivaled performance, familiar shape Excellent color - Up to 93 CRI (color rendering index);Color stability over life within +/- 200 K;Lamp to lamp color consistency over life;High lamp efficacy;Elite 50W lamp provides 29% more initial lumens as compared to a standard MasterColor Protected CMH ED-17 50W lamp*;Elite 50W lamp provided 52% more mean lumens as compared to a standard MasterColor Protected CMH ED-17 50W lamp+;* Philips MasterColor Elite Protected CMH ED-17 4200K 50W Lamps provide 4645 initial lumnes compared to MasterColor Protected ED-17 50W lamp at 3600 iniitial lumens.;+ Philips MasterColor Elite Protected CMH ED-17 4200K 50W Lamps provide 3716 mean lumens compared to MasterColor Protected ED-17 50W lamp at 2450 mean lumens. MasterColor Elite Protected Ceramic Metal Halide ED-17 4200K Lamps provide excellend lumen maintenance and outstanding performance over time in a protected lamp. Application versatility;Universal operating position;Suitable for use in open fixtures;Dimension, base and light center length are same as standard MasterColor ED-17 lamps;Available in 50W, 70 W and 100W Elite lamps Ideal for general lighting,downlighting,and flood lighting.