Go Back   Aquarium Advice - Aquarium Forum Community > Saltwater and Reef > Saltwater Reef Aquaria
Click Here to Login

Join Aquarium Advice Today
Reply
 
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
 
Old 10-19-2004, 09:23 PM   #1
Aquarium Advice Freak
 
leafyseadragon's Avatar
 
Join Date: May 2003
Location: California
Posts: 205
Question about MH coverage

I will eventually upgrade my tank to a 75L, which is 60" wide.

It seems that the price of one MH lamp and bulb is comparable to the price of a 48" PC (4 x 65W) unit.

What I'd like to do is hang the MH light right above the center of the tank, and put an anemone directly underneath. Then on the darker regions away from the center, I want to transfer my mushroom corals.

My question is this: with just one MH light in the center, how bright will the opposite ends of the tank be given the 60" width? If it's too dark, I'll go with PCs and alter my coral selection.
__________________

__________________
Fish are friends, not food.
leafyseadragon is offline   Reply With Quote
Old 10-19-2004, 09:28 PM   #2
Aquarium Advice Addict
 
lando's Avatar
 
Join Date: Mar 2004
Location: Savage, MN
Posts: 7,889
That really will not give you very good light coverage. Besides, your tank most likely has a center brace in the middle of it. That would cut back on the light even more. What type of anenome are you thinking of getting?
__________________

__________________
lando is offline   Reply With Quote
Old 10-19-2004, 09:30 PM   #3
AA Team Emeritus
 
Join Date: Oct 2002
Location: Chatsworth, GA
Posts: 4,071
Send a message via Yahoo to loganj
A MH bulb will cover about 24" with intense lighting. I think you'd see a big difference in the intensity of the light over a 60" span with one MH in the middle. It really depends on what you want to keep in the tank. If you are going to primarily keep low-med light corals, I'd go with the PC's. If you want some animals with high light requirements, I would look into at least two MH bulbs. JMHO.
__________________
Life is not measured by the number of breaths we take, but by the moments that take our breath away.
Logan J
loganj is offline   Reply With Quote
Old 10-20-2004, 01:39 AM   #4
Aquarium Advice Freak
 
leafyseadragon's Avatar
 
Join Date: May 2003
Location: California
Posts: 205
Thanks to both of you for your advice.

It's really not a question of which corals I want to keep. The issue is how much money I have to spend on lighting (not enough for 2 MH fixtures), which will restrict my choices of corals. Since the price of one MH fixture and the 4 bulb PC are close, I was just wondering if I could get away with one MH, but it sounds like the ends of the tank will be too dark?

Since I am just starting out with corals, I prefer the more durable species that don't require large amounts of lighting. But with a 260W PC for 75 gallons, that's 3.5 watts per gallon. Is that enough for low to moderate light corals?
__________________
Fish are friends, not food.
leafyseadragon is offline   Reply With Quote
Old 10-20-2004, 01:47 AM   #5
Aquarium Advice Activist
 
Join Date: Aug 2004
Location: CA
Posts: 103
Don't upgrade to MH unless you are abosultely sure it is your last light equipment on that particular tank. A mistake can be costly when it comes to MH lights.
__________________
piggybank2005 is offline   Reply With Quote
Old 10-20-2004, 10:17 AM   #6
AA Team Emeritus
 
Join Date: May 2002
Location: Virginia
Posts: 2,256
Send a message via ICQ to fishfreek Send a message via AIM to fishfreek Send a message via MSN to fishfreek Send a message via Yahoo to fishfreek
Remember MH is a single point of light source where as the PC is florecent and you get the same light output thru the entire lenght of the bulb. If you do indeed have that center brace the MH light over it will look very bad. For an idea take a 2" wide bit of paper and hold it under a incadecent light and see the shadows it casts.

The reason florecent bulbs dont cast a shadow when they are over the center brace is because the light is also being output on the sides of the bulb that is not over the brace and that light cancels out the shadow being cast by the brace.
__________________

__________________
Remember dont tap the glass, your fish will think you're an idiot -Anonymous mother

Check out our articles area. 30+ Aquatic articles for your enjoyment
Are you in or around the Shenandoah Valley area? If so click here to join our regional forum.
fishfreek is offline   Reply With Quote
Reply

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
What could this black coverage be and is it responsible for the death of my LPS? reef_junkies Saltwater Reef Aquaria 7 06-27-2009 03:49 PM
Heater question and check valve question brigoody General Hardware/Equipment Discussion 3 11-17-2007 04:34 PM
Stupid question, but...Nitrite/Nitrate question AIKakashi Saltwater Reef Aquaria 10 04-11-2006 12:00 PM
Poop question...Gross I know. Wondering. And sleep question Melissamustang Saltwater Reef Aquaria 5 01-23-2006 03:31 PM
Question about sand (not a normal question though) Civicman86 Saltwater & Reef - Getting Started 3 12-17-2005 02:18 AM







» Photo Contest Winners








Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 08:52 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.