Re: [GSAS-Member] Catalina T5HO fixture report; photoperiod?

[Susan Welenofsky <welenofsky@comcast.net>]

How many watts and what K?

Susan

On Dec 27, 2009, at 1:36 PM, Matt Staroscik wrote:

> The Catalina T5HO light fixture that I ordered arrived, and it is indeed
> very nice. It seems solidly constructed, has 2 switches so you can run it at
> half or full power, and has individual reflectors for each bulb. At less
> than $200 shipped with bulbs of your choice, it seems like a heck of a deal
> for a 48" HO fixture. There's no way to know what kind of parts are used
> inside but these fixtures have a good reputation so I am optimistic. It also
> included legs though I don't plan to use them.
> 
> This fixture does indeed direct a lot more light down in to the tank, so I
> will probably have to get a second timer and adjust the photoperiod for a
> burst of mid-day full power.
> 
> For a heavily planted non-CO2 tank that is almost 24" deep, what photoperiod
> would you plant guys recommend? I have seen everything from 6 to 14 hours
> being used. I am thinking about 10 hours, with 5 hours of full power... but
> I really have no idea. Previously, I ran 12 hours full power, where full
> power was somewhat less than full power in the new fixture.
> 
> If/when I add CO2 I assume I will want a longer/brighter photoperiod since
> the plants will want to grow faster? Up to 12 hours, with 6 at full power?
> 
> The plants I have all require "low to moderate" light, btw... Crypts,
> swords, hairgrass, assorted bunches of stem plants.
> 
> Thanks for any ideas...
> 
> MS
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