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Thread: Lighting an Aquarium with PAR instead of Watts Reply to Thread
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Topic Review (Newest First)
11-21-2014 08:39 PM
drasan Thanks for the help.
11-21-2014 07:42 PM
jeffkrol
Quote:
Originally Posted by drasan View Post
I appreciate all of your research & explanations - However, i have no clue what it all means. I asked my son who is currently in college & he had no idea either. Is there a simple way for a person of normal intelligence to figure out if 2 T8 aqueon 15 watt 18" bulbs are enough for a low light planted 55 gallon tank. The lights are in the original hood. Please help, I'm 53 and don't feel like going back to school. LOL Thanks
sure.. you have 30W of T8's over 55gal.. Even w/out a PAR meter I can guarantee low light...

11-21-2014 06:28 PM
drasan I appreciate all of your research & explanations - However, i have no clue what it all means. I asked my son who is currently in college & he had no idea either. Is there a simple way for a person of normal intelligence to figure out if 2 T8 aqueon 15 watt 18" bulbs are enough for a low light planted 55 gallon tank. The lights are in the original hood. Please help, I'm 53 and don't feel like going back to school. LOL Thanks
10-25-2014 03:25 PM
IiScaPeJuNkiEiI 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!
10-25-2014 09:27 AM
sprocketdiver Ok try again so lights set for 7 hours continuous now 3 catfish and new plants.
10-24-2014 02:32 AM
sprocketdiver 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,
10-21-2014 05:25 AM
Hoppy
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.
10-20-2014 09:13 PM
sprocketdiver 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.
07-06-2014 05:33 PM
Hoppy
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.
07-06-2014 02:11 AM
rthomas529 How can a 26w cfl produce 50% of par as a 23w cfl?
06-17-2014 11:07 PM
mistuhmarc 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!
06-10-2014 05:27 PM
plantbrain 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.........
06-10-2014 04:20 PM
eisBear 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!
06-10-2014 05:55 AM
burr740 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!
06-10-2014 05:27 AM
Hoppy 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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