Quote Originally Posted by PharmaCan
Depends on the bulb - they differ from brand to brand.
He's right.

Sunmaster & Son Agro make some fantastic 400W bulbs that each put out around 36,000-40,000 lumens, I believe. If you can justify the pricetag, they probably make the best 400W HPS bulbs on the market.
Mr. Clandestine Reviewed by Mr. Clandestine on . Enviro vs HPS what would be better 1 400 watt HPS or 2 200 watt Envirolites ? Rating: 5