How do I get a PAR for my light ? - The Planted Tank Forum
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post #1 of 16 (permalink) Old 06-01-2014, 09:26 PM Thread Starter
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Cool How do I get a PAR for my light ?

Aquaticlife T5HO 48 inch 2 bulb 108 total watts. Can anyone tell me how or where to get the PAR for this light. Thank you.
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post #2 of 16 (permalink) Old 06-01-2014, 09:55 PM
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I'm looking for par for this fixture, since I use it for a low tech setup. I do know that a 4 lamp is supposed to give you about 50 par at 18 inches. I tried looking up the par data for the dual light fixture on the Aquaticlife website, and couldn't find anything. I hope someone gives you par information.


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Last edited by kidgrave; 06-01-2014 at 10:06 PM. Reason: typo
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post #3 of 16 (permalink) Old 06-01-2014, 10:05 PM
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The reflectors will also play an extremely large roll in your PAR readings, as non efficient reflectors will not reflect the light into the tank, while good reflectors will direct the light directly into the tank.

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post #4 of 16 (permalink) Old 06-01-2014, 10:12 PM
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It could change depending on the bulbs you use. Here is a post from a user that measured it with one 6000K and one 10000K bulb.
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post #5 of 16 (permalink) Old 06-01-2014, 10:23 PM Thread Starter
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6000 vs 10000

What would be the difference in these two bulbs ?
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post #6 of 16 (permalink) Old 06-01-2014, 10:25 PM
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You'd have to measure the light with a PAR meter.
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post #7 of 16 (permalink) Old 06-01-2014, 11:38 PM
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Quote:
Originally Posted by rick dale View Post
What would be the difference in these two bulbs ?
The light spectrum (color). If you add the distance of your bulbs to the substrate maybe Hoppy will chime in. He's the lighting guy. I would just get two 6500K bulbs and call it medium light if it were me. I would at least dose Excel with those unless you raise the light more than what those PAR measures were. Then again I'm FAR from a lighting expert.
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post #8 of 16 (permalink) Old 06-02-2014, 12:05 AM Thread Starter
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lighting

Yeah , I am using two 6700 k bulbs right now , but I don't really like the look they give off. But whatever is best for the plants.. I am using excel daily as directed.
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post #9 of 16 (permalink) Old 06-02-2014, 12:24 AM
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Quote:
Originally Posted by Zorfox View Post
It could change depending on the bulbs you use. Here is a post from a user that measured it with one 6000K and one 10000K bulb.
That post says 40 PAR at 19 inches. The chart in https://www.plantedtank.net/forums/sh...d.php?t=184368 says 100 PAR for a 4 bulb fixture, which would be 50 PAR for two bulbs. The numbers are about as close to being the same as you can expect.

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post #10 of 16 (permalink) Old 06-02-2014, 01:26 AM Thread Starter
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correct par

So , is 50 par good or not? Should I continue using the two 6700 k bulbs or switch two a 6700 and a 10,000 k.
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post #11 of 16 (permalink) Old 06-02-2014, 04:32 AM
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Originally Posted by rick dale View Post
So , is 50 par good or not? Should I continue using the two 6700 k bulbs or switch two a 6700 and a 10,000 k.
Changing one bulb to a 10000K bulb will have a small effect on PAR, if any at all. If you aren't happy with how the tank looks with 2 6700K bulbs, change one to 10000K and see if that looks better. I have one 10000K bulb that I have used on a couple of tanks, and I like it better than the 6700K bulb I had been using, but that is just personal taste. (And, not all 10000K or all 6700K bulbs give the same appearance to the tank.)

50 PAR is medium light. If that is what you want, it is good.

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post #12 of 16 (permalink) Old 06-02-2014, 12:07 PM Thread Starter
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par

thanks for the help.
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post #13 of 16 (permalink) Old 06-02-2014, 08:44 PM
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Quote:
Originally Posted by Hoppy View Post
That post says 40 PAR at 19 inches. The chart in https://www.plantedtank.net/forums/sh...d.php?t=184368 says 100 PAR for a 4 bulb fixture, which would be 50 PAR for two bulbs. The numbers are about as close to being the same as you can expect.
Hoppy, I'm not sure if that chart is accurate with the par readings for the AquaticLife par readings. I have a dual AquaticLife 30 inch fixture on my 37 gallon. My light fixture sits on top of my tank, and the light is 20 inches away from the substrate, and I haven't had any problems with plant growth or algae. My dirted tank has been setup for 3 weeks and I haven't dosed any co2.

I went to the AquaticLife website, and saw that they have par data available for the 4 lamps. The problem is that I don't know how to read that chart, so I was wondering if you or someone doesn't mind taking a look at it. Here is the link below:

http://www.aquaticlife.com/sites/def...s/420037_0.pdf


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Last edited by kidgrave; 06-02-2014 at 08:44 PM. Reason: Typo
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post #14 of 16 (permalink) Old 06-03-2014, 05:39 AM
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Quote:
Originally Posted by kidgrave View Post
Hoppy, I'm not sure if that chart is accurate with the par readings for the AquaticLife par readings. I have a dual AquaticLife 30 inch fixture on my 37 gallon. My light fixture sits on top of my tank, and the light is 20 inches away from the substrate, and I haven't had any problems with plant growth or algae. My dirted tank has been setup for 3 weeks and I haven't dosed any co2.

I went to the AquaticLife website, and saw that they have par data available for the 4 lamps. The problem is that I don't know how to read that chart, so I was wondering if you or someone doesn't mind taking a look at it. Here is the link below:

http://www.aquaticlife.com/sites/def...s/420037_0.pdf
It is a confusing set of charts. I'm not sure how to read it either, but it looks like the 48 inch 4 bulb fixture gives about 100 PAR at 18 inches, which would be 50 PAR for a 2 bulb fixture.

Hoppy
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post #15 of 16 (permalink) Old 06-04-2014, 08:31 PM
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Quote:
Originally Posted by Hoppy View Post
It is a confusing set of charts. I'm not sure how to read it either, but it looks like the 48 inch 4 bulb fixture gives about 100 PAR at 18 inches, which would be 50 PAR for a 2 bulb fixture.
I don't know why they made that chart so confusing lol. Not long ago, I was reading a thread about someone who did par readings with an Aquatic Life fixture, and that person claimed to have been getting around 50 par with a 4 lamp at 18 inches. I'll do my best to find that post, and link you to it. Personally, I don't think the dual fixtures give out that much par at 18 inches, because my tank has been doing really good with this fixture, without co2. I do however, run my lights for 6 hours a day. I am growing dwarf sag, amazon swords, java fern, java moss, and ludwigia repens. I bough this fixture because I have seen two people with low tech/low light setups using a 48 inch dual fixture. One person was using the 48 inch on a 55 gallon, and the other on a 75 gallon, and both individuals stated that they didn't dose co2. I wish I had a par meter


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