T5 on a standard 90 gallon - The Planted Tank Forum
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post #1 of 14 (permalink) Old 12-05-2019, 06:48 PM Thread Starter
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T5 on a standard 90 gallon

Would 5 T5 tubes be enough light on 24" 90 gallon? Would be 54 watt 46 inch bulbs. Too much light for low tech or about right? Thanks
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post #2 of 14 (permalink) Old 12-05-2019, 08:37 PM
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That would be very high light depending on the bulbs used....

2 over a 90 would be lowish light.
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post #3 of 14 (permalink) Old 12-05-2019, 09:20 PM
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I am currently building a 75 gallon right now and I have 5 total that will go in the hood (54W). That said, it can be a ton of light. I am new to T5HO and learning a lot, but different bulbs can have substantially different PAR values.

My though was rock the 5, and play around to see what works for me.

There is a share your bulb thread running right now on this forum with some great info.
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post #4 of 14 (permalink) Old 12-06-2019, 06:12 PM Thread Starter
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Quote:
Originally Posted by Quagulator View Post
That would be very high light depending on the bulbs used....

2 over a 90 would be lowish light.
Thank you, just concerned with the depth.

Bump:
Quote:
Originally Posted by Grobbins48 View Post
I am currently building a 75 gallon right now and I have 5 total that will go in the hood (54W). That said, it can be a ton of light. I am new to T5HO and learning a lot, but different bulbs can have substantially different PAR values.

My though was rock the 5, and play around to see what works for me.

There is a share your bulb thread running right now on this forum with some great info.
Thank you and yes I have looked at the thread. Loving the "pink" bulbs and may look at getting something online. I have sunblaster 6400 k bulbs available locally that I can use on two (double) fluval glo T5 fixtures that I just picked up on the cheap. I already have a single sunblaster fixture not being used and figured I may as well put that over the tank as well. The depth of 24 inches is the concern I have. Maybe 4 is too much? Try 3? I am using blasting sand with diy root tabs. Will be getting standard "easy" plants.
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post #5 of 14 (permalink) Old 12-06-2019, 06:30 PM
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Originally Posted by megatrev62 View Post
Thank you, just concerned with the depth.

Bump:

Thank you and yes I have looked at the thread. Loving the "pink" bulbs and may look at getting something online. I have sunblaster 6400 k bulbs available locally that I can use on two (double) fluval glo T5 fixtures that I just picked up on the cheap. I already have a single sunblaster fixture not being used and figured I may as well put that over the tank as well. The depth of 24 inches is the concern I have. Maybe 4 is too much? Try 3? I am using blasting sand with diy root tabs. Will be getting standard "easy" plants.

you can use this old chart as a sort of guesstimate on "par" for your setup.
Obviously bulb type and reflectors matter..but it should be helpful..

"IF" I remember correctly prob done w/ 6500k tubes..


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post #6 of 14 (permalink) Old 12-06-2019, 06:34 PM
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Originally Posted by megatrev62 View Post
Thank you, just concerned with the depth.


Thank you and yes I have looked at the thread. Loving the "pink" bulbs and may look at getting something online. I have sunblaster 6400 k bulbs available locally that I can use on two (double) fluval glo T5 fixtures that I just picked up on the cheap. I already have a single sunblaster fixture not being used and figured I may as well put that over the tank as well. The depth of 24 inches is the concern I have. Maybe 4 is too much? Try 3? I am using blasting sand with diy root tabs. Will be getting standard "easy" plants.
2 6400K - Low light
1 x 6400K + 1 x pink bulb - Low light

3 is doable but... you'll need to ensure you keep the tank very clean, keep the filters very clean, allow no mulm to build up, keep a fairly high water change schedule going.

start with 2 bulbs and move to 3 after the plants settle in and mature. Excel / Met14 would be of benefit too.

4 is also doable but... CO2 is starting to become necessary at that point, I ran the equivalent of 3 over a 90 gallon with a very short photo period and the filter was 2+ years mature... lean water column dosing + root tabs, very low fish load. Met14 dosing and 30% weekly water changes. Huge amounts of plants too... try and stock up on as many plants as you can off the start. I tried out 4 buy algae was always there... just too much energy and not enough CO2 to back it up. Check it out here if you want:

https://www.plantedtank.net/forums/1...light-90g.html
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post #7 of 14 (permalink) Old 12-06-2019, 06:43 PM
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Keep in mind (as implied above) you can compensate for the output w/ photoperiod..
Say you run 2 tubes 8hrs and growth isn't up to snuff..
Increase photoperiod slowly..

If like 12 hours is the sweet spot then one can shift to 3 tubes 8 hours if one wants.
(assumption)

Worst thing in my mind is to much light too soon if lightly planted..but that is a bit independent of tube number..sort of.

more than one way to skin a catfish (correct use)
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post #8 of 14 (permalink) Old 12-06-2019, 06:47 PM
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Worst thing in my mind is to much light too soon if lightly planted..but that is a bit independent of tube number..sort of.
Can't stress that point enough...

Start slow and low, work your way up
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post #9 of 14 (permalink) Old 12-06-2019, 09:41 PM Thread Starter
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Thanks very much. I think I'll do 2 for 8-9 hours for the first few weeks and see how the plants react. I have a moderate plant load but will be picking up a ton of stem plants this weekend. I am converting from fish only to plants and fish but the bioload would not be considered high really. I do understand about the low fish and lots of plants from the get go. Kind of doing it backwards but that's all I can do. Thanks again

Just to add, I am contemplating co2 in the future. At least I know I could go that route as well. I find lighting to be the hottest topic with planted tanks. Great to know there are those who know all about lighting !!!
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Last edited by Darkblade48; 12-07-2019 at 07:17 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #10 of 14 (permalink) Old 12-07-2019, 12:17 AM
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I find lighting to be the hottest topic with planted tanks. Great to know there are those who know all about lighting !!!
Oh no, you've only just entered my friend, you'll be right down the rabbit hole in no time at all!

Loads of other hot topics to explore that have nothing to do with lighting
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post #11 of 14 (permalink) Old 12-10-2019, 05:06 PM
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you can use this old chart as a sort of guesstimate on "par" for your setup.
Obviously bulb type and reflectors matter..but it should be helpful..

"IF" I remember correctly prob done w/ 6500k tubes..


Can't believe this chart is still around. It's so inaccurate and doesn't take into account bulbs used at all.

Nowadays you can use 4 bulbs and spit out lower part than 2 bulbs with different bulbs. I've used 4 bulb t5s on a 60p while only pushing out 80 par so telling the op he will have too much light is inaccurate without knowing the exact bulbs, reflectors, and ballasts he will be using.

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post #12 of 14 (permalink) Old 12-10-2019, 09:24 PM
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Can't believe this chart is still around. It's so inaccurate and doesn't take into account bulbs used at all.

I've used 4 bulb t5s on a 60p while only pushing out 80 par

Actually vhart sort of tells you that..
Catalina 4 bulb t5HO prob hits only about 70PAR at 24"

Not here to defend it but when one has NOTHING one needs some sort of start..


Besides not all Quantum (PAR.. yeesh) meters are accurate w/ all the visible spectrum either... so certain bulbs woudn't be measured accurately anyways.. like 660NM red tubes and older
"PAR" meters..

I'd worry more about the inaccuracies of the orig "PAR" meter used but other data, here and there, is in the same ballpark..

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post #13 of 14 (permalink) Old 12-10-2019, 10:06 PM
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Point is that OP asks if 5x 54W bulbs at 24 inches is too much light and people proceed to tell him its way too much light without even asking him what bulbs or light he even has. That is bad information.
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post #14 of 14 (permalink) Old 12-10-2019, 10:38 PM
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Originally Posted by gus6464 View Post
Point is that OP asks if 5x 54W bulbs at 24 inches is too much light and people proceed to tell him its way too much light without even asking him what bulbs or light he even has. That is bad information.
Not everyone said it was too much light- it was mentioned that different bulbs have vastly different PAR...

Quote:
Originally Posted by Quagulator View Post
That would be very high light depending on the bulbs used....

2 over a 90 would be lowish light.


Quote:
Originally Posted by Grobbins48 View Post
I am currently building a 75 gallon right now and I have 5 total that will go in the hood (54W). That said, it can be a ton of light. I am new to T5HO and learning a lot, but different bulbs can have substantially different PAR values.

My though was rock the 5, and play around to see what works for me.

There is a share your bulb thread running right now on this forum with some great info.
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