So Cal Lighting 28 W equals 250 W

So Cal Lighting
Bulb Specs:
Actual Watts: 28 Watts
Comparable to HPS/MH: 250 Watts
Beam Spread: 180°.
Dimmability: 100%-30%.
Average Life: Up to 58,500 hours (up to 10 years!)
Warranty: 3 Years
Main Overall Dimensions: 3.65" Diameter x 11" Length