LED light no longer as bright - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 09-17-2013, 04:49 PM Thread Starter
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LED light no longer as bright

so i had a Marineland Double bright running on my 29g that i broke down and moved to my 40b(that i got a current fixture). so i figured i instead of selling my old marineland fixture i would put it on my 20l, and get rid of the T5 i had on it.

so i mounted the marinelandon the tank (5in above the tank) and the tank just isn't anywhere near as bright as the 29 was. and it doesn't seem to matter how high or low the light is it just looks dull.

any thoughts?

Will
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post #2 of 11 (permalink) Old 09-17-2013, 05:04 PM
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post #3 of 11 (permalink) Old 09-17-2013, 05:30 PM
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Quote:
Originally Posted by Aquatic Delight View Post
so i had a Marineland Double bright running on my 29g that i broke down and moved to my 40b(that i got a current fixture). so i figured i instead of selling my old marineland fixture i would put it on my 20l, and get rid of the T5 i had on it.

so i mounted the marinelandon the tank (5in above the tank) and the tank just isn't anywhere near as bright as the 29 was. and it doesn't seem to matter how high or low the light is it just looks dull.

any thoughts?
Probably an illusion.. When I first got back into fish I had a Marineland "puck" that I thought was fairly bright at the time.. When I bought my 40 and designed my own light, I moved the 20gal to a different location and put the same puck above it.. looks dull and really weak.. The light didn't change. My perception did..
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post #4 of 11 (permalink) Old 09-18-2013, 12:39 AM
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Consider that a 29 gal tank has a bottom surface area of 360 sq/in and a 40b has a bottom surface area of 648 sq/in, you can see that you have the same light trying to light up almost twice the surface area. I would expect the 40 gal to look dim compared to the 29 gal.

Depending upon what you want to keep in the tank, consider upgrading the lighting. You could either add an additional fixture, or replace the whole thing.
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post #5 of 11 (permalink) Old 09-18-2013, 06:27 AM Thread Starter
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i should have specified that the light is now on a 20l and not the 40b. which is why i am so confused. shouldn't it appear brighter on a 20l?

Will
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post #6 of 11 (permalink) Old 09-18-2013, 07:22 AM
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It would depend on the substrate and the background, is either darker in the 20L?

Is there any possibility that the driver could be damaged? Are any of the LEDs brighter than others? If it's still under warranty (IDK if they do that in this industry) send it in to get replaced and forget about the issue. If not then I'm sure we can figure it out.

About how long has it been running (like a rough estimate of the hours)? How many LEDs are there on the board and what wattage is the fixture?

People are too often merely stating an assumed truth from flawed observation.
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post #7 of 11 (permalink) Old 09-18-2013, 04:22 PM Thread Starter
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its a marineland double bright. i'ts had at the very most 5,00hrs on it. all the leds have the brightness look to them.

it now has a black back ground, and eco complete on the new set-up as opposed to white sand on the old set up.

new tank


old tank



the photo doesn't really show it well, it looks a lot brighter in the picture than it does in person. idk maybe i'm just expecting to much of this light. i just figured that on a shallower tank the light would like brighter than on a taller tank.

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post #8 of 11 (permalink) Old 09-18-2013, 04:28 PM
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Hello,

I think it's the black sand which does gives the impression there is less light, in fact it's real, there is less light because black sand reflects almost no light.

White sand will reflect the light a lot.

Michel.

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Last edited by micheljq; 09-18-2013 at 06:06 PM. Reason: typo
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post #9 of 11 (permalink) Old 09-18-2013, 04:44 PM
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Quote:
Originally Posted by micheljq View Post
Hello,

I think it's the black sand which does gives the impression there is less light, in fact it's real, there is less light because black sand reflect almost no light.

White sand will reflect the light a lot.

Michel.
+1 on that!
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post #10 of 11 (permalink) Old 09-18-2013, 04:44 PM
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Originally Posted by jeffkrol View Post
Probably an illusion..


You have somewhat the same thing I had. The 20gal was in the "open".. Then it was put in a more enclosed area.. light looks a lot "darker" there..

Oh and yes white vs dark sand is not helpful
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post #11 of 11 (permalink) Old 09-18-2013, 04:52 PM
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I'd also say that it's the black sand and maybe the height above the tank if they are different. Remember, black absorbs all wavelengths of light, and white reflects all.

In the end, the plants are getting more light than in the taller tank.

People are too often merely stating an assumed truth from flawed observation.

Last edited by Legot; 09-18-2013 at 04:53 PM. Reason: changed
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