LED Equivalent - The Planted Tank Forum
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post #1 of 8 (permalink) Old 06-27-2020, 01:24 AM Thread Starter
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LED Equivalent

I have a 75 gal. tank which is currently lighted by 6, 4' 6500K florescent tubes. What would be the equivelent LED lighting?
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post #2 of 8 (permalink) Old 06-27-2020, 01:33 AM
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Originally Posted by LilysDad View Post
I have a 75 gal. tank which is currently lighted by 6, 4' 6500K florescent tubes. What would be the equivelent LED lighting?
A lot of multiple fixtures basically. Maybe one ONF Flat One+ the 90cm version.

https://shop.onf.com.tw/products/fla...-pendant-style


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post #3 of 8 (permalink) Old 06-27-2020, 01:35 AM
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Originally Posted by LilysDad View Post
I have a 75 gal. tank which is currently lighted by 6, 4' 6500K florescent tubes. What would be the equivelent LED lighting?
A small fortune..


Assuming t5ho's w/ good reflectors
you need to replace 324 "watts" of photons.
That is reef level lighting.
You would need at the VERY least 162 real watts of LEDs and really more realistically about 227 watts..

3 Radion XR15 gen4 freshwaters would be the high end start..
almost w:w
2 is possible but a bit poor on covering a 48" length but doable.

OR

4 AI prime freshwaters
3 would be on the low end
https://fragtasticreef.com/ai-prime-...yABEgIlFvD_BwE


$836 plus mounts..
Next up..
https://sbreeflights.com/sbox-reef-l...eme-wifi-.html
$540
Not sure of the real watts here but it isn't 474


There are others so it's not an all inclusive list.
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post #4 of 8 (permalink) Old 06-28-2020, 01:29 PM Thread Starter
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Wow! Even replacing tubes annually, I guess I'm way ahead of anything else.
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post #5 of 8 (permalink) Old 06-28-2020, 03:07 PM
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Wow! Even replacing tubes annually, I guess I'm way ahead of anything else.

well one could use cheap LED flood lights..


https://www.lepro.com/2-pack-50w-out...tl-listed.html
One per tube..
$100...

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post #6 of 8 (permalink) Old 07-01-2020, 09:30 PM
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Wow! Even replacing tubes annually, I guess I'm way ahead of anything else.
The whole replacing tubes annually thing is more of an urban legend and has been debunked. The reason why bulbs are replaced on a schedule in a reef tank is because as bulbs age they undergo a spectrum shift towards red which can cause algae in a marine environment. That doesn't matter in planted tanks. The output differential on an aging bulb is statistically irrelevant. You can easily run a bulb for 2 years in a planted environment running 8 hours a day with programmed start ballasts and bulb will be fine. With a rapid start ballast they might blow out before you hit 2 years but even then it's not guaranteed. What kills the life of a T5 bulb faster is the type of start and not how long they actually run.
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post #7 of 8 (permalink) Old 07-01-2020, 09:37 PM
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The whole replacing tubes annually thing is more of an urban legend and has been debunked. The reason why bulbs are replaced on a schedule in a reef tank is because as bulbs age they undergo a spectrum shift towards red which can cause algae in a marine environment. That doesn't matter in planted tanks. The output differential on an aging bulb is statistically irrelevant. You can easily run a bulb for 2 years in a planted environment running 8 hours a day with programmed start ballasts and bulb will be fine. With a rapid start ballast they might blow out before you hit 2 years but even then it's not guaranteed. What kills the life of a T5 bulb faster is the type of start and not how long they actually run.



gus's point holds but there is a difference between lumen maintenance and MTBF..

Point is generally the bulb breaks before the tube fades..

Quote:
Conventional lamps, like T8 fluorescents, have regular and predictable catastrophic failure mechanisms. Thus, lighting specifiers can be confident that maintenance personnel will be alerted to the need to relamp, so light levels will not drop too far below the target. In other words, the lamps are expected to burn out before lumen output can drop too far.
https://www.pnnl.gov/main/publicatio...PNNL-22727.pdf

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Last edited by jeffkrol; 07-01-2020 at 09:56 PM. Reason: edit
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post #8 of 8 (permalink) Old 07-01-2020, 09:57 PM
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gus's point holds but there is a diffference between lumn maintenance and MTBF..

Point is generally the bulb breaks before the tube fades..
Yeah and MTBF is generally something like 20K hours on modern T5 bulbs. That's the thing running 24/7 for over 2 years which is never happening in our uses. That's why generally people see a T5 bulb pop at around the 2-2.5 year mark. It's the on and off that killed it and output wise it will be putting out the same lumens as it did when you took it out of the box.

So moral of the story just run T5 bulbs until they pop. Ohh and never listen to aquarium manufacturers about anything related to lighting unless they're Philips. Fun fact a Radion is rated at 30K hours L70. Philips coralcare is rated at 25K hours L90. Which is the better built fixture?
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