120w LED vs. 400w of HID. (5years)
120 watt LED: 1.Fixture = $250. Electric bill 12hrs/day all year @ $.015 KW =$82.12.
Total cost for 5 years to run the 600w = $660.62
400 watt HID setup. 1. 1- 400 watt ballast $160 2. 1- Reflectors A/C $115 4. 1- 400 watt bulbs $50 4. 4 years of replacement bulbs $200 5. Electric bill 12hrs/day all year @ $0.15 KW =$262.80
Total cost for 5 years to run 400w HID lighting. $1724.00

Just a comparison. Hope this helps.