Lighting question
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > Specific Aspects of a Planted Tank > Lighting


Reply
 
Thread Tools Display Modes
Old 08-30-2006, 07:57 AM   #1
GazK
Algae Grower
 
GazK's Avatar
 
PTrader: (0/0%)
Join Date: Feb 2006
Location: Manchester, UK
Posts: 115
Default

Lighting question


I have an AH Supply 2x55W bright Kit over a Juwel Trigon 190L Aquarium
The height from the lights to the substrate is about 60cm

The tank is a corner one and I had real trouble getting high power lights to fit it, in the end building a canopy and replacing the top with 6mm toughened plate glass

What I need to know is am I getting enough light to the bottom of the tank ?

I notice I am getting a lot of brownish/dying leaves down at the bottom of the tank

Would it be better without the glass ? Is the glass likely to be taking some of the power / penetration out of the bulbs ?

Anyone got any ideas ?

Ta
__________________

I reject your reality and substitute my own

GazK is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-30-2006, 08:11 AM   #2
Betowess
Planted Tank Guru
 
Betowess's Avatar
 
PTrader: (27/100%)
Join Date: Dec 2004
Location: Skagit County, Washington State
Posts: 3,199
Default

You are a tiny bit over 2 watts per gallon at ~ 24 inches. Factor in what? three inches of substrate. That is a little low, but should be OK for lower light plants (or slower growing plants). The glass is definately pulling some light, maybe 10-15% if not really clean especially. I have all my tanks open top. Faster evap, but much easier to play around with and trim etc. A little more light would certainly help. Trimming and spreading out the plants a little might help. Are you dosing any Potassium and other ferts at all? On the plus side, you don't need CO2 at this level and those AHS reflectors kick! HTH bob
__________________




Three Tanks...Eheim 2128 & XP3-90G, Eheim 2128-65G, Eheim 2232-25G.... Tek 4x54 watt T5-90G, Aqualight 96watt PC 65G low tech, 65 watt Aqualight-25G.... Hydors-90G & 65G ... Flourite in 90, 65, & 25 Gallons, .... Auto Water Change/Auto dosing on 90 & 65 gallon..... AGA member......
Betowess is offline   Reply With Quote
Old 08-30-2006, 09:22 AM   #3
GazK
Algae Grower
 
GazK's Avatar
 
PTrader: (0/0%)
Join Date: Feb 2006
Location: Manchester, UK
Posts: 115
Default

Ta

I have calculated that there is about 40 US Gallons in the tank when I take into account substrate, wood etc so I reckoned nearer 2.75 WPG (am I looking at this wrong).

The substrate is about 3 inches as you surmised so the depth from the
lights to the substrate would be about 53cm. Distance from the lights to the water is about 7cms (guessing as I'm not at home at the moment).

I am using the EI method and have CO2 and am dosing macros and micros

The trouble is I don't see how I can get any more light over the tank ???

What do you think ?

Thanks
__________________

I reject your reality and substitute my own

GazK is offline   Reply With Quote
Old 08-30-2006, 06:02 PM   #4
Betowess
Planted Tank Guru
 
Betowess's Avatar
 
PTrader: (27/100%)
Join Date: Dec 2004
Location: Skagit County, Washington State
Posts: 3,199
Default

Quote:
Originally Posted by GazK View Post
Ta

I have calculated that there is about 40 US Gallons in the tank when I take into account substrate, wood etc so I reckoned nearer 2.75 WPG (am I looking at this wrong).

The substrate is about 3 inches as you surmised so the depth from the
lights to the substrate would be about 53cm. Distance from the lights to the water is about 7cms (guessing as I'm not at home at the moment).

I am using the EI method and have CO2 and am dosing macros and micros

The trouble is I don't see how I can get any more light over the tank ???

What do you think ?

Thanks

One question. Is the brownish dying leaves on top of plants or are they under a canopy of healthy growing leaves. Because most stem plants will have less healthy growth when shaded. I know thats a no brainer, but just making sure.

I don't think most of us actually use the actual volume when computing the WPG rules... but those rules are pretty general and broadbrush. But you have a fairly deep tank. I have one 55 watt on a 26 bow, but its about 2.5 inches less deep. You should be fine, but a little more light would help. Didn't you say it was a corner anyways? Those are hard to light. Also, do you have the light resting on the glass top? Is there a plastic hinge blocking light as well. An additional light might help. Could you rig an additional 4 inch reflector and pop another 36 watt AHS light in there? Not sure if the one ballast will do. Kim at AH Supply would be good to contact. He can help you figure it out. Very helpful guy.

But the more I think about it, you really probably have just enough light, but more would help.
__________________




Three Tanks...Eheim 2128 & XP3-90G, Eheim 2128-65G, Eheim 2232-25G.... Tek 4x54 watt T5-90G, Aqualight 96watt PC 65G low tech, 65 watt Aqualight-25G.... Hydors-90G & 65G ... Flourite in 90, 65, & 25 Gallons, .... Auto Water Change/Auto dosing on 90 & 65 gallon..... AGA member......
Betowess is offline   Reply With Quote
Old 08-30-2006, 06:54 PM   #5
GazK
Algae Grower
 
GazK's Avatar
 
PTrader: (0/0%)
Join Date: Feb 2006
Location: Manchester, UK
Posts: 115
Default

Yeah it's a corner
It's a real pity, hindsight is great, when we got started didn't know anything about plants, lighting etc etc.
As soon as I started getting into it I realised that lighting them is a complete nightmare.

Anyway - most of the dying leaves are down the bottom as you guessed

I had a glass top cut so there's no hinge or obstruction blocking the light
I just measured and the distance from the glass to the substrate is 19" (48cm).

I reckon your right, more light needed but not sure how I'm going to manage it, needs some creative work I think.

I'm going to remove the glass and see how it goes

Thanks for all the help

Cheers
Gary
__________________

I reject your reality and substitute my own

GazK is offline   Reply With Quote
Old 08-30-2006, 11:13 PM   #6
Hoppy
Planted Tank Guru
 
Hoppy's Avatar
 
PTrader: (74/100%)
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 18,738
Default

I think you have enough light for most plants, just not enough for a low growing lawn of HC, for example, or for some few very high light demanding plants. Most plants should do fine with that light. Your stem plants should not be planted in a big bunch - no more than 3 in a single bunch. And, that glass top is going to irritate you to death eventually, getting covered with white water deposits, dust, getting in the way of feeding and pruning, etc. For the little good it does I don't think it is worth it.
__________________
Hoppy
Hoppy is online now   Reply With Quote
Old 08-31-2006, 08:31 AM   #7
GazK
Algae Grower
 
GazK's Avatar
 
PTrader: (0/0%)
Join Date: Feb 2006
Location: Manchester, UK
Posts: 115
Default

Think you're right
The glass is going at the weekend
Just a bit worried about condensation on the lights / ballast

Fingers crossed
__________________

I reject your reality and substitute my own

GazK is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 02:10 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012