Total System Watts for Old Fixtures

I'm sure you've realized by now that in order to calculate the return on investment for a new lighting system, you're going to have to know how much energy your new fixtures will save you. In order to know that, you're going to have to have an idea of total wattage the existing fixtures you have are consuming. You could dismantle a sample of the fixture and read the specs for the ballast and lamps you have, but that can be tedious and very time consuming. Another option is to use a standardized system wattage table that provides a very good rough estimate on the total system watts for your old lamps and ballasts. The following list includes some of the most common fixtures you'll encounter while doing energy audits and it provides the total watts that these fixtures draw. 

Fixture Name	Total Watts
100W MH	142
175W MH	210
250W MH	295
400W MH	461
1000W MH	1080
1000Wx2 MH Tandem	2160
250W HPS	295
310W HPS	365
400W HPS	460
600W HPS	665
750W HPS	840
1000W HPS	1100
F32T8 - 4 Lamp 4'	136
F40T12 - 1 Lamp 4'	52
F40T12 - 2 Lamp 4'	96
F40T12 - 3 Lamp 4'	148
F40T12 - 4 Lamp 4'	192
F96T12 - 1 Lamp 8'	100
F96T12 - 2 Lamp 8'	173
F96T12HO - 1 Lamp 8'	140
F96T12HO - 2 Lamp 8'	281
F96T12VHO - 2 Lamp 8'	390