can you have to much light
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 02-06-2004, 04:39 PM   #1
hixy
Algae Grower
 
PTrader: (0/0%)
Join Date: Dec 2003
Location: birmingham england
Posts: 133
Default

ive been round the local lfs shops in my area and one of them is selling a twin 250 watt metal halide light .would this be over the top for my 4x2x18 aquarium as its 500 watt output, he only wants 200 for it


hixy
hixy is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-06-2004, 05:17 PM   #2
Rolo
Wannabe Guru
 
PTrader: (7/100%)
Join Date: Dec 2003
Location: Twin Cities, Minnesota
Posts: 1,717
Default

If you want to grow a tank of algae, thats the lighting I would use. Thats about 5.6 WPG in MH! Assumning your tank is ~ 90 gallons. You will mostly be battling algae and nutrient problems all the time with that amount.

For larger tanks, about ~2.5 wpg is a nice and balance amount of light.
__________________
Rolo is offline   Reply With Quote
Old 02-06-2004, 08:08 PM   #3
hixy
Algae Grower
 
PTrader: (0/0%)
Join Date: Dec 2003
Location: birmingham england
Posts: 133
Default

thanks alot mate,another quick maybe silly question is 70 of mh light the same as 70 watt of floresence


thanks

hixy
hixy is offline   Reply With Quote
Old 02-06-2004, 09:03 PM   #4
Wasserpest
Are these real?
 
Wasserpest's Avatar
 
PTrader: (175/100%)
Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,087
Default

Fluorescent and MH light have a similar efficiency, so the watt output is comparable. 500 Watts is a lot of light and a lot of heat.

Remembering all the algae stories of MH owners, I wouldn't...
Wasserpest is offline   Reply With Quote
Old 02-06-2004, 09:44 PM   #5
GDominy
Planted Tank VIP
 
GDominy's Avatar
 
PTrader: (0/0%)
Join Date: Jul 2002
Location: Victoria,British Columbia, Canada
Posts: 3,363
Default

Actually... from personal experience.. thats not too bad.

If you raise the fixture away from the top of the tank by say.. 8-12" you will have fantastic lighting for a planted tank.
There is absolutely no reason why you cant use MH lighting over a planted tank, you just have to be aware of a few things like Heat, intensity etc.. some plants may react a bit to the intense non-diffused light but they will adapt.
GDominy is offline   Reply With Quote
Old 02-06-2004, 10:45 PM   #6
Rolo
Wannabe Guru
 
PTrader: (7/100%)
Join Date: Dec 2003
Location: Twin Cities, Minnesota
Posts: 1,717
Default

Well yeah, if you raise the height of the lighting then it will be less a problem. I think that would be nescessary for HM becuase of the heat. So in fact it could work, but trial and error will need to find the proper height; and 500W is still alot.
__________________
Rolo is offline   Reply With Quote
Old 02-06-2004, 10:56 PM   #7
mario
Planted Member
 
mario's Avatar
 
PTrader: (0/0%)
Join Date: Feb 2003
Location: Boston, MA, USA
Posts: 287
Default

If you have two hundred pounds to spare, go for it. Supend them well over your tank and create one of those beautiful open-topped planted tanks.
mario is offline   Reply With Quote
Old 02-06-2004, 10:58 PM   #8
GDominy
Planted Tank VIP
 
GDominy's Avatar
 
PTrader: (0/0%)
Join Date: Jul 2002
Location: Victoria,British Columbia, Canada
Posts: 3,363
Default

Mario's got the idea ;-) I've been thinking I might just do this for my 135 Gallon :-) Set up 2-3 250 watt pendants over it... hmmm...
GDominy is offline   Reply With Quote
Old 02-06-2004, 11:10 PM   #9
putty
Planted Tank Enthusiast
 
PTrader: (0/0%)
Join Date: Nov 2003
Location: Vancouver, B.C.
Posts: 666
Default

Open top tanks are beautiful, with plants growng out of them etc. I love watching fish from above the surface of the water. When I redo my tanks I am making them both open top.
__________________
got CO2?
putty is offline   Reply With Quote
Old 02-06-2004, 11:31 PM   #10
Wasserpest
Are these real?
 
Wasserpest's Avatar
 
PTrader: (175/100%)
Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,087
Default

Beautiful, yes. But evaporation, and condensation on the cold walls of your sweet home need to be considered...
Wasserpest is offline   Reply With Quote
Old 02-08-2004, 03:47 AM   #11
GDominy
Planted Tank VIP
 
GDominy's Avatar
 
PTrader: (0/0%)
Join Date: Jul 2002
Location: Victoria,British Columbia, Canada
Posts: 3,363
Default

wasserpest.... none of my tanks have lids exactly.. I have 3 windows open at all time. I dont need to heat my place either because I have enough lights and computer equipment running it keeps everything toasty.. lol
GDominy 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Here's a great how to lorax Riparium/Terrarium/Vivarium 3 06-09-2009 12:24 AM
Azoo Galaxy Light Renske Lighting 12 11-06-2005 03:47 PM
The Potential Importance of Tank Depth on Light Attenuation Splash Lighting 25 03-26-2004 07:41 PM
Transparent Light Cover (Looks like fresnel lens) EnzoChang Lighting 5 02-03-2004 03:10 PM
Light and pH Nordic Fertilizers and Water Parameters 2 12-24-2003 02:34 AM


All times are GMT. The time now is 08:18 PM.


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