Grow Light Operating Cost

	1000 watt Sodium	600 watt Sodium	400 watt Sodium	250 watt Sodium	1000 watt Halide	400 watt Halide	250 watt Halide
Ballast Wattage	1100	665	464	295	1080	458	295
Cost per Month	$52.80	$31.92	$22.27	$14.16	$51.84	$21.98	$14.16
Initial Lumens	130000	89000	50000	28500	110000	36000	20500
Mean Lumens	126000	81000	45000	25600	88000	28800	17000
Mean Lumens per Watt	114	121	96	86	81	62	57
Light Coverage at 2500 Lumens per sq. ft.	7.1 x 7.1 Feet	5.7 x 5.7 Feet	4.2 x 4.2 Feet	3.2 x 3.2 Feet	5.9 x 5.9 Feet	3.4 x 3.4 Feet	2.6 x 2.6 Feet