Re: [GSAS-Member] Subject: Which Bulb

[Paul Wallace <pwallace@u.washington.edu>]

Shango:

In my tanks the considerations are A) what the room needs and B) what the 
plants need in that order.  I think the 4100K home depot bulbs are too brown 
but look fine when mixed with the home depot 6700.  For PC I like the 10,000K 
series for crisp white light light. In general I find that bulbs are cheap and 
mixing (front to back, left to right looks strange) gives the best results.

In going back to your origional question, 130W over 29 gal is on the high side. 
 On my 20 Long I run just 1 10,000K bulb (no CO2, no ferts) and all is well.  I 
suggest two timers with 1 lamp on early and the 2nd only during peak viewing 
hours.  You can also run a 6700K and an actinic for fish color if you desire.  
Have fun!

-Paul


On Sun, 23 Nov 2008, Shango Los wrote:

> Thanks for this helpful link, Roy.  Indeed, I do hope that a heavyweight
> grower comments.  The info I am getting is incomplete and no one at a pet
> store agrees with each other.  I have room for two bulbs.  I just need to
> know what the best combo is and why.  I am leaning towards a 6700K and a
> 10,000K again but really have no good reason.
>
> Thanks again.
>
> Shango
>
>
> On 11/23/08 8:22 AM, "Seattle_Aquarist" <Seattle_Aquarist@comcast.net>
> wrote:
>
>> Hi Shango,
>>
>> Here is a link to APC concerning light spectrum and growth.
>>
>> http://www.aquaticplantcentral.com/forumapc/general-aquarium-plants-discussi
>> ons/55756-light-spectrum-plant-growth.html
>>
>> (You may have to cut and paste)
>>
>> APC has a forum just dealing with just lighting and plant growth.  "mackers"
>> comment on 5500k makes sense, the lower spectrum promotes flowering not
>> growth.  Maybe Paul, Erik, and some of our other "plant people" could share
>> what they think?
>>
>> Roy
>>
>>
>>
>>
>>
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>
> --
> Shango Los
>
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