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 ceeloojones
Stranger
Registered: 10/11/10
Posts: 5
Last seen: 15 years, 1 month
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 lights 
#530894 - 02/26/11 09:02 AM (15 years, 3 months ago) |
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theoretically which would be better 3 -400 s or 2 600 s
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KaptKid
Spaced Pirate
 
Registered: 04/20/08
Posts: 5,616
Loc: Bright Side of the Sun
Last seen: 11 months, 8 days
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What size grow space?
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Child of the 60's, Tripping ever sence.
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ceeloojones
Stranger
Registered: 10/11/10
Posts: 5
Last seen: 15 years, 1 month
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Re: lights [Re: KaptKid]
#530898 - 02/26/11 09:53 AM (15 years, 3 months ago) |
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some thing small like 6 ft by 4 ft tray in a 7+7+7
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 Harry_Ba11sach
cannoisseur
Registered: 04/20/08
Posts: 11,753
Loc: Nepal 
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2x600 in almost every situation.
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FurrowedBrow
Free yourself from yourself
Registered: 04/20/08
Posts: 12,045
Loc: Carpal Tunnel
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Harry_Ba11sach said:
2x600 in almost every situation.
yeah, id agree with this. the 600 watts are more efficient than any other wattage.
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maryanne3087
Stranger
Registered: 06/27/10
Posts: 1,111
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600w's have the highest lumen per watt output.
I wonder about the canopy penetration of 400w's esp ceramic metal halides does anyone know? I suppose I could google.
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Harry_Ba11sach
cannoisseur
Registered: 04/20/08
Posts: 11,753
Loc: Nepal
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Lower than the 600W, that's all you need to know.
Not only are the 600's higher efficiency in Lumen/watt (even though lumens are a useless measurement, people insist on using it  ) but the penetrational advantage far outweighs the "lack" of even coverage you'd get from 3x400's.
Honestly if I was making this purchase I wouldn't even consider the 400's being contenders. There would be no question in my mind 
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maryanne3087
Stranger
Registered: 06/27/10
Posts: 1,111
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Although plants don't use lumens, isn't it a relatively fair comparison between different bulbs as the PAR range/spectrum is usually the same % of overall lumens?
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