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Topic Review (Newest First)
Today 06:43 AM
candymancan I still don't think this PAR is correct... If this were true then having 1 T8 light or a Power compact light in a 25 inch tall tank apparently doesn't matter they both are low light... lol AIn fact this graph shows a PC light is almost identical to a single T8 light and that deff cant be true.. I've held a T8 6700 and a PC 6700 together and the PC is nearly double the brightness in the tank height tank. In fact I had 2 T8's and 2 T5NO over my 27g hexagon and replaced those 4 lights with 1 Power compact and my plants are still red and purple..

This is a Joke because I have some pretty strong reds and purples in some of my medium/high light plants using my Power Compact lighting.. And whats is AHS PC ?? What does the AHS stand for ?

This graph is basically saying the par from 1 T5HO is almost 50 at 25 inches and a PC light is like 2 or 3 par at 25 inches.. HAHAH ok lol... Has anyone actually measured a PC light with a reflector... these NO REFLECTOR graph are very biased... Why are you comparing individual T5HO reflectors with T8's and T5NO or PC light with no reflectors or white back grounds..

I haven't seen a T5NO use a white background.. The ones I've seen use reflectors, and my PC lights have reflectors on them... what company sells a PC light with no reflector. I've searched google for HOURS i cant find one person who has done measurments on PC lights with reflectors.. So until then that graph you posted above.. lol..


PAR is another FAD like watts per gallon.. It isn't accurate when measured in the proper 400-700nm range. PAR only measures the ACTIVE radiation output of a light... Not the usefull radiation PUR... That can be used.. so this is exactly another WPG fad that i wish would just go away.... You can have 2 6700k bulbs and 2 Plant grow bulbs.. those plant grows will outgrow those 6700k yet how can that be if the PAR is the same ? Because PAR isn't measuring the usefull lighting.. omg.. this is giving me a headache


Also your chart you post Jeffkrol and the ones posted on this sticky.. The measurements are WAYYYY off.. The ones he posted for T5HO's using like 15 different fixtures.. the average PAR at 25 inches for TWO bulbs is around 40-56 PAR And his chart for the PC lights.. using 1 36 or 55w BULB for 25 inches the par is 23.. So using a duel fixture for 2 bulbs the par is around 46. That's about the same as most of the T5HO light fixtures soo according to these charts a PC light near identical to a T5HO.. just depends on the reflector your T5HO has... Yet according to your chart PC bulbs are almost like T8's...



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!
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