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Fri, Aug 14, 09 at 8:56
| I am trying to decide if a T5 HO lighting scheme would work for a new greenhouse facility being built. In the past we have used a combo of MH and HPS but the energy efficiency and reduced bulb replacement cost of the T5 HO make it tempting. So, my question is:
What is the maximum distance an 8 lamp Tek T5 HO with mixed 3000 K and 6500 K lamps can be placed from the plants and still obtain a LUX of 22000? Thanks for your help. |
Follow-Up Postings:
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| I have been trying to find this kind of info. for over a year now and even the manufacturer can't seem to come up with this info so for my own personal satisfaction I'm going to buy a meter for this purpose. This is the cheapest I could find with the correct type of measurement and not a bad investment(If it works correctly)if you want to keep your lighting at it's maximum output. http://www.transcat.com/Catalog/productdetail.aspx?itemnum=401025 |
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| I have a TEK T5HO 4 lamp. Also have a meter to measure light but can only give you foot candles. With 2 lamps on and about 12 inches away from bulbs it's 700fc. Turn on additional two lights (total 4) and the output doubles to 1400fc. So I assume you get about 700fc for every two bulbs you add. Hope this helps. |
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| It looks like you are going to get 5,000 lumens per bulb which translates into 5,000 lux if placed a foot away. Eight bulbs would give you 40,000 lux at that distance, if you move it two feet away you would have ~20,000 lux. Mike |
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| According to this site(below) 700fc converts to 7534.7 lux so you would be getting 3767 lux per bulb at 12". Eight bulbs would give you 30,138 lux at 12". |
Here is a link that might be useful: Foot-Candles to Lux
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| 16 inches will give you 22,604 lux or lumens going by 2800fc at 12". T5 HO specs are saying 5000 lux initially. I don't know if that means 12" or 2" |
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