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Old 09-19-2003, 07:26 PM   #1
aquaphish
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I currently have 2.5WPG but want to add mor. I use 4 T-8 36" flourecent in a 40 gal tank, but was thinking of changing over to PC lights. I have seen the ones a AH Supply and was wondering which would the 2-96watts be to much for a 40 gal??

Please if there are any other lighting systems that use PC lights please inform me and post some links so I can check them out

Thanks,
Ed
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Old 09-19-2003, 08:12 PM   #2
DLeDeaux
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4.8 WPG? That's an aweful lot of light. I have read a lot about people who had that much light and wound up reducing the amount of light because of tank stability issues. Algae growth, nutrient replenishment, CO2 useage, etc.

I wouldn't run that much wattage on one of my tanks. I have 3.8 and sometimes feel like it's a little too excessive.

Unfortunantly, the next lowest option is 2x55 which only puts you slightly above what you have now. If you could find a 2x65 kit, I think it might put you in a good sweet spot though.
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Old 09-19-2003, 08:58 PM   #3
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Ok... A watt is not a good measure of light intensity. You cant compare 110 watts of PC lighting to 120 watts of T8 lighting... Its apples and oranges...

If I were you, I would simply add a single 96 Watt CF bulb to your existing configuration (or replace 1-2 tubes with it).

That would be pretty birght
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Old 09-20-2003, 09:48 PM   #4
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Hey GDominy!!! Why did I not think of that!!!! If I remove 2 of the T-8's which are 25 watts each and add a 96 watt PC that would give me 3.65WPG. This is close to what I want. And if i remove just one T-8 and add the 96 watt PC that would give me close to 4.25!!!

Does anyone have any comments on using these parameters for lighting??
I just might use 2 T-8 and one 96 watt PC. Then see the results. If everything looks good then maybe I'll add another T-8 and see what I get at 4.25 watts!!!

Thanks for the suggestions everyone. And please give some comments on my plans. I would really like to have some feedback and some suggestions.

I currently have a DIY CO2 system going and I keep the pH at 6.6-6.8 and the KH at around 5 deg. With the added light would I need to add more CO2 to keep the pH below 7.0? I find that my plants do best at the pH I maintain.

As for fertilizers I have reciently started to use some KNO3 because the NO3 levels would drop to 0. And I also add some K2SO4. In addition I use the Kent Marine products Freshwater Plant which is a K~Fe and micronutrient supplement; Pro Plant which is N, Boron,Magnesium and sulfur. I also add Freshwater Essential which is a trace mineral supplement.
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Old 09-21-2003, 12:06 AM   #5
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I like the 2 x T8 1 x PC combo... That would give you a really spread of light...
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Old 09-21-2003, 12:36 AM   #6
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If you are headed into the 3.5+ wpg range on a 40 gallon tank you should really think about getting a pressurized system.
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Old 09-21-2003, 05:16 AM   #7
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Thanks again for the comments all!!!
I am off to order my 1x96 PC.
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