Re: [APD] Lighting Comparison

["S. Hieber" <shieber at yahoo_com>]

My recollection is that 3 or 4 wpg were often recommended when T12s and shop lights were commonly used. For HO fluorescents such as T5s and Compacts, 2 wpg is a better guidepost. MHs would come in at about the same efficiency as T5s and Compacts.

You could make a rough comparison by getting teh lumen values for comparable wattages of the diff bulbs and use that as a proportional adjustment.


----- Original Message ----
From: Vaughn Hopkins <hoppycalif at yahoo_com>
To: aquatic plants digest <aquatic-plants at actwin_com>
Sent: Thursday, May 3, 2007 4:32:15 PM
Subject: Re: [APD] Lighting Comparison


Bill
I have never seen the answer to this anywhere.  My memory is that the  
2 wpg number started to be used when only T12 bulbs were in use, and  
with white painted flat "reflectors".  Clearly 2 wpg of compact  
fluorescent bulb light in an AH Supply reflector is a lot more  
light.  So, this is an excellent question.

Vaughn

On May 3, 2007, at 12:58 PM, bill wrote:

> Assuming that 2 WPG of T12 light is adequate to grow most plants, and
> ignoring all other variables, what is the equivalent WPG for T8,  
> T5, compact
> fluorescents, and metal halides?
>
> Please excuse this question if it has been answered elsewhere.  I  
> couldn't
> find anything.
>
> Thanks.
>
> Bill
>

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