Comparison Induction Metal Halide High Pressure Sodium Warranty Compact: 5 Years Separate: 10 Years None None Life hours Compact: 60,000 Separate: 100,000 6,000 - 20,000 24,000 Energy Saving Efficiency Excellent Lower Lower Lumen Efficacy Photopic Efficacy: 150 Plm/W (Plm: Pupil Lumen) Traditional Efficacy: 80 Lm/W Photopic Efficacy: 110 Plm/W (Plm: Pupil Lumen) Traditional Efficacy: 75 Lm/W Photopic Efficacy: 90 Plm/W (Plm: Pupil Lumen) Traditional Efficacy: 120 Lm/W Lumen Depreciation Rate % 5% @ 2.000 Hours 5% @ 2.000 Hours 5% @ 2.000 Hours Lamp Operating Temperature Lower, <80oF Reduces A/C cost Higher >300oF Increased A/C cost Higher >350oF Increased A/C cost CRI >80 (Ra) 65 - 80 (Ra) 60 (Ra) Re-strike Instant Needs up to 10 - 15 Minutes Needs up to 10 - 15 Minutes Flicker None Average Average Glare None Average Average Environmental Safety No Mercury No lamp waste in 10 years Contains mercury Concern with much lamp waste over 10 years Contains mercury Concern with much lamp waste over 10 years   Comparison Induction Compact Fluorescent Fluorescent Tubes Warranty Compact: 5 Years Separate: 10 Years None None Life hours Compact: 60,000 Separate: 100,000 8,000 - 10,000 8,000 - 20,000 Energy Saving Efficiency Excellent Good Lower Lumen Efficacy Photopic Efficacy: 150 Plm/W (Plm: Pupil Lumen) Traditional Efficacy: 80 Lm/W Photopic Efficacy: 85 Plm/W (Plm: Pupil Lumen) Traditional Efficacy: 50 Lm/W Photopic Efficacy: 69 Plm/W (Plm: Pupil Lumen) Traditional Efficacy: 70 Lm/W Lumen Depreciation Rate % 5% @ 2.000 Hours 5% @ 2.000 Hours 5% @ 2.000 Hours Lamp Operating Temperature Lower, <80oF Reduces A/C cost Higher >100oF Increased A/C cost Higher >150oF Increased A/C cost CRI >80 (Ra) 65 - 80 (Ra) 60 (Ra) Re-strike Instant Instant, with initial 3 minute warm up time Instant, with initial 3 minute warm up time Flicker None Average Average Glare None Average Average Environmental Safety No Mercury No lamp waste in 10 years Contains mercury Concern with much lamp waste over 10 years Contains mercury Concern with much lamp waste over 10 years