paul
3/13/2003 9:48:00 AM
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| Do conversion bulbs lose lumens? |
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I looked at a conversion bulb for my 400W MH at the local hydro store, and the clerk said the proper bulb was 370(?) watt HPS equivilent. She also said I would lose lumens with a conversion bulb, but don't HPS bulbs create more lumens per watt?
Would an HPS converting to MH also be less efficient?
What percentage of the light is lost?
thank you |
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The Green Thumbs
3/14/2003 11:29:00 PM
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| Re: Do conversion bulbs lose lumens? |
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Here are the numbers for you:
Lumen output for a 360w conversion bulb: around 45,000
Lumen output for a true HPS bulb: around 50,000
Most people use conversion bulbs because of the cost factor. To use a true HPS bulb, you have to have an HPS ballast. With a conversion bulb, you can still use the same ballast, and achieve an HPS light spectrum.
When using a conversion bulb, you are also not getting a "true" HPS spectrum, you are getting as best as you can with an MH ballast. That is also the other thing to consider. I don't know what the spectrum analysis is, but I know they are not the same. |
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paul
3/25/2003 11:39:00 AM
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| Re: Do conversion bulbs lose lumens? |
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Hi,
Do you know how Mercury Vapor lights compare in, terms of spectrum, with MH? I've heard that they emit from the blueish spectrum but they look kind of yellow.
thanks |
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The Green Thumbs
3/25/2003 10:55:00 PM
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| Re: Do conversion bulbs lose lumens? |
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| Mercury Vapor lights emit in the blue/green spectrum, but it is a very narrow portion. Definitely not suited for plant growth, mercury vapor lights have the least efficient lumen-to-watt ratio of any HID light (along with the too narrow spectrum they emit). If you are thinking about using mercury vapor lights, I highly suggest against it. |
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