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Old 03-12-2007, 06:15 PM   #11 (permalink)
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Are they T5 linear tubes or T5 CF/PC bulbs? Can you get spectral outputs for what you are thinking of using? T5 is the most efficient and will give you more light penetration required for taller tanks. A lot of the German hobbists are using T5 but they dont always tell the brand name.
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Old 03-12-2007, 06:43 PM   #12 (permalink)
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It's so much better to know why you are doing something the way you are doing it than to just hope blindly it works out right. That's why I started digging though all the information I could find.

I'm really trying to justify the amount of money that my T5 setup cost me, and I want to make sure I got the right bulbs considering the cost.

So I guess given all you know about this, and that I am only starting to cobble it together, I will ask you a question. Which should I have bought?

I bought Hagen T5 linear bulbs based on the relative power that is shown in the spectrum. Thing is... as you said and I understand now, they do not necessarily reflect what the bulb actually puts out. The bulbs I bought were 18000k. The show large blue spike at 430 with smaller mound in blue around 450. Then they show red spike around 600 with smaller red mound around 650. They are Hagen Powerglo. I felt that since it was showing lots of red and blue they would be good for plants. I didn't buy Hagen 6700k Lifeglo because the peak was all in green and I knew that to be why the lumens were so high (3000 per 39watt bulb), and that green had no part in plant growth.

What do you know the Hagen bulbs aside from the fact that they poorly market there bulbs? Do you know where to get an actual spectral graph of their bulbs? One bulb comparison page I referenced in my forums actually showed that Powerglo had rather high Par efficiency. I feel good about this but still wonder based on the high color temp. Obviously it would be strong in blue but what about red? That last question was rhetorical...lol

Last edited by Moment; 03-12-2007 at 06:44 PM.. Reason: question asked
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Old 03-13-2007, 09:50 AM   #13 (permalink)
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This is an excellent thread with actual data backing up the post as opposed to just comments on how it grows plants. Ive been looking around for a thread like this since i am thinking about changing my bulbs.

Thanks Newt
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Old 03-13-2007, 03:28 PM   #14 (permalink)
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Hagens are a bit pricey. Attached are the graphs for the PowerGlo, LifeGlo and AquaGlo. The AquaGlo is probably the better plant bulb. It is somewhat like the GroLux but lower power. I also attached two graphs of normalized spectral plots so that you can see the output intensity at a given nanometer in true relation to each other. You can go to HomeDepot and get some T5 Philips 6500K that will balance out the lighting and make it more pleasing to the eye.

PowerGlo:


LifeGlo:


AquaGlo:




Hagen spectral graphs:
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Old 03-13-2007, 03:31 PM   #15 (permalink)
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Thank you, Boink

Great User name.
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Old 03-13-2007, 04:09 PM   #16 (permalink)
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would you by any chance have spectral graphs for coralife 6700 and 10k bulbs? those are what i have now and i was curious

thanks
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Old 03-13-2007, 04:40 PM   #17 (permalink)
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The end of page one of this thread is the Coralife 6700K (Trichromatic). I will see if I can get one for the 10,000K Coralife.
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Old 03-13-2007, 06:42 PM   #18 (permalink)
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Boink, here is the 10,000K bulb:

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Old 03-14-2007, 05:05 AM   #19 (permalink)
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i find that useing the GE 9325 k grows plants the best out of all the cf that i have used
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Old 03-14-2007, 10:43 AM   #20 (permalink)
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really good thread!!
I thought I should gice you some links, then I don't need to write so much =)
Some links might be telling things that allredy have been told here, but that's gooder than contrary.

http://www.aquabotanic.com/lightcompare.htm
http://reefkeeping.com/issues/2006-04/sj/index.php
http://defdac.googlepages.com/ (I think its on swedish, but its anyway good for us then )
http://saurama.aqua-web.org/
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