low medium or high light - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 05-30-2014, 03:08 AM Thread Starter
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low medium or high light

I have about 1.9 wpg of t5HO light on my 180. how much light is this?
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post #2 of 10 (permalink) Old 05-30-2014, 04:53 AM
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Do you have 6 54 watt, 4 foot T5HO bulbs? Do they have good reflectors, which surround the bulbs so you see two images of each bulb, one on each side? Are they sitting right on top of the tank? Are the lights made by Coralife or FishNeedIt, or by some other manufacturer? All of those questions are needed to guess how much light you have. See https://www.plantedtank.net/forums/sh...d.php?t=184368

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post #3 of 10 (permalink) Old 05-30-2014, 08:42 AM
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Hoppy is the man to get you the right equipment, so you will know how effective the light works for your tank.

I have 216 watts T5 HO on my 170G tank, the fixture is 2 inches above the water, water is 2ft from top to bottom, still give me 35-40 equivalent PAR in the bottom dim area, enough light.


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post #4 of 10 (permalink) Old 05-30-2014, 03:03 PM Thread Starter
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im not the brightest when it coms to light but heres what I got.

I have 3 100w t5ho hydroponics grow lights with 95% Germantown hammer tone reflectors. they say they put out 10,000+ lummins each(not sure about par). the bulbs are 6400K. here are some pics.
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post #5 of 10 (permalink) Old 05-30-2014, 10:53 PM
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A 100 gallon tank is usually 6 feet long, so each of those lights must be about 2 feet long, using 4x24 watt bulbs. That is about the same as having 4 x 6 foot long bulbs over the full length of the tank. You could have just about anything from about 40 to about 100 PAR light intensity at the substrate. The first would be low medium light, and the latter would be high light. You would need a PAR meter to be at all sure what you have.

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post #6 of 10 (permalink) Old 05-31-2014, 03:50 AM Thread Starter
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is there a way to mathematically find the par using the lumins and the kelvin?
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post #7 of 10 (permalink) Old 05-31-2014, 04:06 AM
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Quote:
Originally Posted by 180g View Post
is there a way to mathematically find the par using the lumins and the kelvin?
No, because color temperature has almost nothing to do with PAR, and lumens is a measure of the light emitted by the bulb, but much of that light never makes it to the aquarium unless you have a very good reflector. The reflector can make a 3-1 difference in PAR.

You can buy a cheap lux meter on Ebay and measure the lux at the same distance as the substrate is from the light, out in the open air, then divide that number by 78 to get a reasonably accurate PAR number.

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post #8 of 10 (permalink) Old 05-31-2014, 04:39 AM Thread Starter
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ok thank you for your helpfulness.
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post #9 of 10 (permalink) Old 06-01-2014, 02:04 AM
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Or, just do like the rest of us experimenting types and just plant that sucker and grow some algae for while!

I wish that lighting was easier for me; things would have gone better faster. But, all's well that ends well.

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post #10 of 10 (permalink) Old 06-01-2014, 03:55 AM Thread Starter
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Or, just do like the rest of us experimenting types and just plant that sucker and grow some algae for while!

I wish that lighting was easier for me; things would have gone better faster. But, all's well that ends well.
ill do that. after all im great at growing algae
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