here it is
Hi,
Typically (not all lamps and ballasts are the same...but usually for 5500K),
175W MH draws 2 amps and produces 12000 lumens (8000 lumens over 1000 hours).
250W MH draws 3 amps and produces 20000 lumens (13000 lumens over 1000 hours).
400W MH draws 4 amps and produces 33000 lumens (22000 lumens over 1000 hours).
So...you get about 60% more light with 250W over a 175W.
As for the 5500 lumen part...I think you refering to the colour of the lamps -- 5500 Kelvin. Higher Kelvin lamps have a higher proportion of blue light over red light.
- Victor.
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