There are two problems with mercury vapor lamps. First, they are not as efficient at turning power to light as HPS or MH lamps are. Using the same current, they emit less than half the light as an HPS and only 60% of an MH. Secondly, mercury vapor lamps, even with improved spectrums, emit a lower percentage of useable light than the more efficient lamps.
You can also email Ed at AskEd@cannabisculture.com and send queries via his website at www.ask-ed.net.
All featured questions will be rewarded with a copy of Ed’s book, The Big Book of Buds.
Sorry, Ed cannot send personal replies to your questions.