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 10-24-2005, 06:28 AM   #1
Aquarium Advice Addict
 
Join Date: May 2005
Location: Central Kentucky
Posts: 6,015
Send a message via AIM to greenmaji
Two 175 watt MH bulbs over a 75 gallon tank.. how far up?

How far would you put them up off the water? providing there is plenty of active circulation (good fans).
just asking for an oppinion.. no right or wrong answers just wanting to get a few oppinons before I put them in.. thanks in advance..
__________________

__________________
greenmaji is offline   Reply With Quote
Old 10-24-2005, 08:54 AM   #2
Aquarium Advice FINatic
 
Join Date: Aug 2004
Location: Gainesville, FL
Posts: 617
I have two 175W MH over my 90 gal. The tank/hood/lights were given to me (I didn't design it) and the bulbs are about 8 inches from the water. I can measure when I get home. I have no cover, nothing between the bulbs and the water. Haven't had any problems. It will heat up the tank a bit without a good fan though.

I've read that if water hits the bulb when it's hot that it will shatter. I can speak from experience ( ) that it won't shatter.
__________________

__________________
Gatorfreak is offline   Reply With Quote
Old 10-24-2005, 09:19 AM   #3
AA Team Emeritus
 
Join Date: Aug 2002
Location: Louisiana
Posts: 7,224
Send a message via Yahoo to Hara
the official instruction book that came with my lights said no less than 12 inches. I have really wanted to put them closer,but am afraid to do so.
__________________
Hara is offline   Reply With Quote
Old 10-24-2005, 09:25 AM   #4
Aquarium Advice Addict
 
Join Date: May 2005
Location: Central Kentucky
Posts: 6,015
Send a message via AIM to greenmaji
How many watts are yours Lisa?
__________________
greenmaji is offline   Reply With Quote
Old 10-24-2005, 09:41 AM   #5
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
My MH is about 10-12" above the tank water. I built a 12" tall enclosure for my 250W MH thats over the 20 gal tank. The enclosure sits down over the tank lip a little bit but the water level is also below the top frame a small amount. In the canopy I have a spider reflector with a mogel mount thats a few inches down from the inside of the enclosure.
__________________
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
Old 10-24-2005, 12:18 PM   #6
Aquarium Advice FINatic
 
Join Date: Oct 2004
Location: kenosha wisconsin
Posts: 653
my 250w MH are 12 inches from the the bottom of the bulb to the water. two 4" fans i can keep my temp where i want it. i think i could have gone closer to the water by a little bit

steve r
__________________
75g RR. 2x250 14k MH / 2x54 T5 act. 29g sump. ASM G1X skimmer. phosban reactor. 80lbs LS, 90lbs LR, 2x seio M620.
kole tang, bicolor angel, mandarin dragonette, ocellaris clown / BTA , cleaner shrimp, 2x peppermint shrimp, a variety of soft, SPS, and LPS corals, orange linckia star.
steve r is offline   Reply With Quote
Old 10-24-2005, 12:25 PM   #7
Aquarium Advice FINatic
 
Join Date: May 2003
Location: Central PA
Posts: 971
IMO, 175w do not produce nearly as much heat as 250w bulbs and are less likely to shatter. I keep my 2x175w on my 55g only about 4" off the surface, but this is because I am using the same canopy I had PC retros in. My new canopy will have them 6" off the surface and I will be comfortable with that amount of space. Even with 250's I'd not lose sleep if they were in the 8-10" range but would not push closer than that.
HoopsGuru is offline   Reply With Quote
Old 10-24-2005, 02:09 PM   #8
Aquarium Advice Addict
 
lando's Avatar
 
Join Date: Mar 2004
Location: Savage, MN
Posts: 7,889
I keep my 2x175 about 9 inches from the surface.
__________________
Some people are like slinkies...they serve no real purpose yet can still bring a smile to your face when you push them down the stairs!:p
Have a great day! Brian
lando is offline   Reply With Quote
Old 10-24-2005, 09:02 PM   #9
Aquarium Advice Addict
 
Join Date: May 2005
Location: Central Kentucky
Posts: 6,015
Send a message via AIM to greenmaji
Thanks for the input so far :P exellent.. :P

So.. 6-9" seems like a good plan so far..
__________________
greenmaji is offline   Reply With Quote
Old 10-25-2005, 11:36 AM   #10
Aquarium Advice Addict
 
Join Date: May 2005
Location: Central Kentucky
Posts: 6,015
Send a message via AIM to greenmaji
btw.. the ballasts are still in trasit and I still need to get reflectors, sockets, soket brackets and bulbs.. so I still have time to think about this.. thanks fokes..
__________________

__________________
greenmaji is offline   Reply With Quote
Reply

Tags
5 gallon, 75 gallon, 75 gallon tank, bulb, bulbs, tan, watt

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
175 watt metal halide retrofit ezy33 DIY Projects 1 09-01-2008 09:12 AM
175 watt Metal Halide Bulb saltyfever General Hardware/Equipment Discussion 3 09-04-2007 02:25 PM
Using higher watt bulbs? Marc118 Saltwater Reef Aquaria 1 05-02-2006 08:39 PM
brand new coralvue 175 watt pendant system FS in WI captivereefs Archive 0 03-05-2006 04:59 PM
15 watt light to much for 10 gallon tank ? Volker Freshwater & Brackish - General Discussion 3 08-21-2005 08:29 PM







» Photo Contest Winners








Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 10:22 AM.


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