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Old 02-12-2016, 08:48 AM   #51
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I find the par lighting levels for different plant species very interesting. Tom Barr states that 40 par uniformly spread across the substrate is enough lights for all levels from beginner to experienced. This table doesn't seem to argue.


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Old 02-12-2016, 10:38 AM   #52
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That is interesting. I have never really researched something like that. It sounds good news. I was going to float the light meter but thought to put it deeper to where the plants are growing from. Hopefully I can test it in a few locations.

If I get keen tomorrow I'll take the meter out and see what the readings are. Fingers crossed it has been doing something apart from complain about the low ph.
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Old 02-13-2016, 09:03 AM   #53
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Included the link on PAR plant preference again just for reference.
fresh water plant PAR levels - Seneye

I did pull the meter out today and it uploaded a bunch of readings to the seneye server. Was mostly plug and play but a few tricks. Once loaded there are various graphs which can be adjusted by time and a few other settings. Fairly quick to get something usable.

I'll post the others on LUX and Kelvin later but below is PAR. I measured where the meter sits and it is actually half way down the tank. Assuming all is working ok, I seem to have a low PAR problem.

The graph on the left is my tank readings, the coloured chart on the right is plant preference (I think, I must check that).

The seneye reef meter only comes on when the lights come on so it looks like I'm getting a PAR of 30 to 40 halfway down the tank. Ignore the squiggle at the end of the graph, I think it was recording while connected to the computer.


PAR - todays readings.



PAR - yesterdays readings.



PAR - 3 days readings.



PAR - month of readings.
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Old 02-13-2016, 03:03 PM   #54
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That's interesting. What fixture are you using. What par is it supposed to give out? Are those submerged readings did you say?


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Old 02-13-2016, 07:22 PM   #55
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That's interesting. What fixture are you using. What par is it supposed to give out? Are those submerged readings did you say?


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Hopefully it's going to be useful. Once the 15m extension cable arrives next week I can hopefully connect it up to the computer for live readings and start testing stuff 😀

The ammonia, ph and other stuff are also working. I'm getting temp warnings so need to learn how to reset them to freshwater.

I guess I still think of it as the poor cousin to the apogee. But still very excited. It could I guess maybe explain why so many plants I had under the LEDs have now failed under this light setup (although the lack of algae is brilliant!).

This is for a submerged tank, normal setup. The light now is a quad t5ho but probably just a low quality one as single reflector. It sits 3 inches above the tank. Covers on the tank are glass strut/Perspex lids.

I think I've got some links to check par for t5's but if anyone has any that would be great 😀

Will dig up how old the bulbs are and what type.
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Old 02-14-2016, 04:21 AM   #56
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Is this chart any good? Click image for larger version

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Old 02-14-2016, 07:13 PM   #57
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It is - that's great. Gee, it really drops off a cliff by depth.

Well I can't figure it out. At say 15 inches down I should have heaps of light with a quad t5ho?

Maybe this week I'll try taking tank Perspex covers off if the extension cable turns up (and works lol). I think the bulbs are 7months old. Been stuck filling out reports so still to check.
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Old 02-15-2016, 03:22 AM   #58
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It is - that's great. Gee, it really drops off a cliff by depth.

Well I can't figure it out. At say 15 inches down I should have heaps of light with a quad t5ho?

Maybe this week I'll try taking tank Perspex covers off if the extension cable turns up (and works lol). I think the bulbs are 7months old. Been stuck filling out reports so still to check.

I don't really get this chart. I've got 2 t5ho with reflectors at about 18 inch so 2 bulbs would take me above high light? If I multiply the par by two?


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Old 02-15-2016, 05:49 AM   #59
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I don't really get this chart. I've got 2 t5ho with reflectors at about 18 inch so 2 bulbs would take me above high light? If I multiply the par by two?


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That's how it looks to me as well. Er, stumped. Do you know if that was in air or water for the graph?

I did replant some poor performing plants on the weekend that had slow growth and noticed that they had hardly put down any roots at all. Maybe that was why the stems were coming out.
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Old 02-15-2016, 08:11 AM   #60
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That's how it looks to me as well. Er, stumped. Do you know if that was in air or water for the graph?

I did replant some poor performing plants on the weekend that had slow growth and noticed that they had hardly put down any roots at all. Maybe that was why the stems were coming out.

Good point. I would imagine air.


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