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Offlineceeloojones
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Registered: 10/11/10
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lights
    #530894 - 02/26/11 11:02 AM (5 years, 11 months ago)

theoretically which would be better 3 -400 s or 2 600 s


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OfflineKaptKid
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Re: lights [Re: ceeloojones]
    #530896 - 02/26/11 11:33 AM (5 years, 11 months ago)

What size grow space?


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Offlineceeloojones
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Re: lights [Re: KaptKid]
    #530898 - 02/26/11 11:53 AM (5 years, 11 months ago)

some thing small like 6 ft by 4 ft tray in a 7+7+7


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InvisibleHarry_Ba11sachM
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Re: lights [Re: ceeloojones]
    #530926 - 02/26/11 02:29 PM (5 years, 11 months ago)

2x600 in almost every situation.


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InvisibleFurrowedBrowM
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Re: lights [Re: Harry_Ba11sach]
    #530953 - 02/26/11 04:23 PM (5 years, 11 months ago)

Quote:

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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Invisiblemaryanne3087
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Re: lights [Re: FurrowedBrow]
    #530977 - 02/26/11 05:44 PM (5 years, 11 months ago)

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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InvisibleHarry_Ba11sachM
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Re: lights [Re: maryanne3087]
    #531100 - 02/27/11 01:14 AM (5 years, 11 months ago)

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 :facepalm:) 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 :shrug:


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Invisiblemaryanne3087
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Re: lights [Re: Harry_Ba11sach]
    #531159 - 02/27/11 04:38 AM (5 years, 11 months ago)

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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