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Old 05-05-2014, 11:15 AM   #316
Yiannis
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20 litres planted with hemianthous Cuba...I dont think tank size has anything to do with pars reached to the substrate...light os 12 inches from subsrate...

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Old 05-05-2014, 11:22 AM   #317
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20 litres planted with hemianthous Cuba...I dont think tank size has anything to do with pars reached to the substrate...light os 12 inches from subsrate...

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Well if u have that bulb an u tryin to light the whole tank different story. The par directly below bulb will be higher than par to front, back, an side to side.
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Old 06-09-2014, 06:12 PM   #318
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Default 29gal 18" high

I'm super glad that there is a PC chart there (Thanks Hoppy), it seems like info available on them is becoming a bit scant. I suppose the tech is just getting old or something. I'm trying to get the lights right on my 29gal which is 30w x 12d X 18h.

I have a dual bulb 65W power compact fixture and I'm only using one bulb, a 6500K 65W coralife 22" bulb that's new. I bought the fixture second hand and it is a 'current usa' brand that seems to have an OK reflector. Based on the PC chart, when its sitting about 2.25 inches above the tank, (about 18 inches above the substrate), I should have around 40 PAR.

I keep getting algae and the light seems bright at that height so I just got finished raising it to about 25 inches above the substrate. My tank could probably be called 'moderately' planted.

In this case, it looks like I might have just under 30 PAR. Did I go up too high? Would I have that much more PAR just because the light is 65W, instead of the tested 55W? It would seem that being in the meaty part of 'medium' would not cause fast algae bloom. I'm trying to have it low-medium light (I do have co2) to avoid algae and keep my shade-loving Tetras and Rasboras happy, plus also avoid what my wife and I were calling the 'x-ray' effect of the bright light on the fish.

Are all of my plants going to die off at the bottom part of the stem or does this sound like a good range of height to start from for a low-medium light tank?

I guess I don't want to be way-overestimating the power of the single lamp only to learn that I needed to look elsewhere to solve my algae problem after all of the bottom plants start suffering. In my house, with my water anyway, so far, the lower the light, the less algae no matter the set-up (so far), so I'm kind of going off of that.
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Old 06-10-2014, 05:27 AM   #319
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The only 65 watt PC lights I have seen had very poor reflectors, so they would give you about half the PAR that the 55 watt AH Supply lights give. But, I am sure I haven't seen anywhere near all of the 65 watt PC lights that are available.
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Old 06-10-2014, 05:55 AM   #320
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I would look at ferts to see if you have a limiting factor somewhere that is keeping your plants from fully utilizing the current level of light, which honestly doesnt sound like too much. The general consensus seems to be to give plants everything they need to grow and algae wont be much of an issue. In my limited experience that has proven to be the case.

Also would like to take this opportunity to thank you, Hoppy, both for your work in this thread and so many others regarding lights. You have helped me understand so much!
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Old 06-10-2014, 04:20 PM   #321
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OK, thanks for the responses all!

Quote:
Originally Posted by Hoppy View Post
The only 65 watt PC lights I have seen had very poor reflectors, so they would give you about half the PAR that the 55 watt AH Supply lights give. But, I am sure I haven't seen anywhere near all of the 65 watt PC lights that are available.
So at 25 inches maybe more like 15-20? That's low eh? Yall might be right I may need to rethink the 25 inch height in that case. Here is what the reflector looks like, it doesnt form around the bulbs like the AH but it does have a fairly mirror like finish and wraps around the outside of the bulbs. Dunno if that helps. Thanks again!
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Old 06-10-2014, 05:27 PM   #322
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Hoppy,

I have a new Apogee light meter now. It's pretty well corrected for the T5's for PAR and the curve. Has a few more options. Has other corrective %'s for other bulb types.

FYI.........
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Old 06-17-2014, 11:07 PM   #323
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Hey Hoppy,

I'm planning on updating the light fixture on my parent's 30gallon tank to three clamp light CFL fixtures. Each fixture will have a 23w CFL in I think more than likely 8.5" diameter domes. Would this be sufficient as medium light for the tank? Thanks!
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Old 07-06-2014, 02:11 AM   #324
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How can a 26w cfl produce 50% of par as a 23w cfl?
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Old 07-06-2014, 05:33 PM   #325
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Quote:
Originally Posted by plantbrain View Post
Hoppy,

I have a new Apogee light meter now. It's pretty well corrected for the T5's for PAR and the curve. Has a few more options. Has other corrective %'s for other bulb types.

FYI.........
Sorry, I haven't been monitoring this much, and I'm in the middle of moving to an apartment, so my aquarium activities are turned off for now. Once I get moved and settled in a bit, I will want to borrow that PAR meter for awhile. I will let you know.
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Old 10-20-2014, 09:13 PM   #326
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Hi. I'm concerned I don't know what I'm dealing with. I have a 15 gallon. It's taller than wide. I have my light suspended from the ceiling. Not sure what distance to hang it though. Measured from the substrate. It's a 4 bulb t5ho fixture. But the reflector is funny. Advice. The reflector has loads of dimples all over it. It's not smooth.
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Old 10-21-2014, 05:25 AM   #327
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Quote:
Originally Posted by sprocketdiver View Post
Hi. I'm concerned I don't know what I'm dealing with. I have a 15 gallon. It's taller than wide. I have my light suspended from the ceiling. Not sure what distance to hang it though. Measured from the substrate. It's a 4 bulb t5ho fixture. But the reflector is funny. Advice. The reflector has loads of dimples all over it. It's not smooth.
A 4 bulb T5HO light is very likely to need to a considerable distance above the substrate, or you will have much more light than you can easily live with. I would use just two bulbs at a time, and try it at about 24 inches from the substrate. That should give you something in the low to medium light range.
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Old 10-24-2014, 02:32 AM   #328
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Thanks for the reply, some photos of the set up, I'm having trouble with algae and my plants not really taking off,
It's economic complete substrate and 1-2 bubbles co2 a second into an inline diffuser reactor
Baby tears all but dead now, watercress is spindly and very unhealthy, only the Brahmi is doing ok,
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Old 10-25-2014, 09:27 AM   #329
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Ok try again so lights set for 7 hours continuous now 3 catfish and new plants.
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Old 10-25-2014, 03:25 PM   #330
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About the par data for cfl lights in a dome fixture.. Is the measurement taken with a polished dome? Or a regular satin finished one? Need to know how the par is affected either way please. Thanks!
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Last edited by IiScaPeJuNkiEiI; 10-25-2014 at 03:25 PM.. Reason: Grammer nazi
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