Reef Central Online Community

Home Forum Here you can view your subscribed threads, work with private messages and edit your profile and preferences View New Posts View Today's Posts

Find other members Frequently Asked Questions Search Reefkeeping ...an online magazine for marine aquarists Support our sponsors and mention Reef Central

Go Back   Reef Central Online Community > General Interest Forums > Lighting, Filtration & Other Equipment
Register Blogs FAQ Calendar Mark Forums Read

Notices

Reply
Thread Tools
Old 07/19/2012, 11:44 PM   #1
lovelyepona
Registered Member
 
Join Date: Dec 2005
Location: Lumberton,Tx
Posts: 53
Watt per gallon for LEDs?

Just curious to know what the watt per gallon requirements are to keep a anemone and sps.


__________________
My life's purpose, is not to arrive at the pearly gates softly on a pillow. But to come sliding in, beat up, torn up, broken up, screaming YEEHHHAAWWW WHAT A RIDE!!!!

Current Tank Info: getting back into the hobby after a break
lovelyepona is offline   Reply With Quote
Old 07/19/2012, 11:46 PM   #2
undertai
Registered Member
 
undertai's Avatar
 
Join Date: Sep 2004
Location: Alameda, CA
Posts: 926
Dose not apply to leds. They are more of a focus light. Putting say like 10 3watt less over a 20 gallon tank. Is like putting a 250w mh light over your tank with a lot less heat.

Sent from my SPH-D710 using Tapatalk 2


undertai is offline   Reply With Quote
Old 07/20/2012, 12:06 AM   #3
lovelyepona
Registered Member
 
Join Date: Dec 2005
Location: Lumberton,Tx
Posts: 53
thank you!


__________________
My life's purpose, is not to arrive at the pearly gates softly on a pillow. But to come sliding in, beat up, torn up, broken up, screaming YEEHHHAAWWW WHAT A RIDE!!!!

Current Tank Info: getting back into the hobby after a break
lovelyepona is offline   Reply With Quote
Old 07/20/2012, 12:06 AM   #4
dieselgrk
Registered Member
 
dieselgrk's Avatar
 
Join Date: Feb 2007
Location: Sacramento
Posts: 592
rapid coral suggests one 3watt led per 15-20 square inches of tank surface


__________________
Paul Voresis

Current Tank Info: Zeohead
dieselgrk is offline   Reply With Quote
Old 07/20/2012, 05:32 AM   #5
alton
Registered Member
 
Join Date: Jan 2005
Location: Zuehl, Texas
Posts: 1,996
Quote:
Originally Posted by undertai View Post
Dose not apply to leds. They are more of a focus light. Putting say like 10 3watt less over a 20 gallon tank. Is like putting a 250w mh light over your tank with a lot less heat.

Sent from my SPH-D710 using Tapatalk 2
Thats funny. Depends on what type of lighting and look do you want? How tall is your tank? If you want a bunch of UV LEDS or if you want to compete with the colors of MH and T5 you will need to add much more. If you just want the 450 blue and 8000K look then less.


alton is offline   Reply With Quote
Old 07/20/2012, 06:57 AM   #6
pwreef
Registered Member
 
Join Date: May 2011
Location: New York
Posts: 517
Also depends on what kind of LED. They are not all the same like say 150 MH bulbs are about the same in amount of light. It's not the same for LED lighting.


__________________
Since May 2011: 57G rimless Deep Blue, Lifereef skimmer/sump, JBJ ATO, RKL, DIY LED using reefll.com 12-up boards
pwreef is offline   Reply With Quote
Old 07/20/2012, 07:52 AM   #7
lovelyepona
Registered Member
 
Join Date: Dec 2005
Location: Lumberton,Tx
Posts: 53
we're planning on setting up a 30g, which will hopefully contain softies, LPS, SPS and an anemone.
So what are the most cost effective LEDs?


__________________
My life's purpose, is not to arrive at the pearly gates softly on a pillow. But to come sliding in, beat up, torn up, broken up, screaming YEEHHHAAWWW WHAT A RIDE!!!!

Current Tank Info: getting back into the hobby after a break
lovelyepona is offline   Reply With Quote
Old 07/20/2012, 08:53 AM   #8
Anemonebuff
Registered Member
 
Anemonebuff's Avatar
 
Join Date: Feb 2001
Location: LI,NY
Posts: 3,881
It's not just the LED. You must also go by what wattage the LED is driven at. You can drive a 3W LED at 1W, 2W, or 3W. You must also take into account what degree optics you are using. 40/60/80 or none(120* spread).


Anemonebuff is offline   Reply With Quote
Old 07/20/2012, 09:56 AM   #9
joelespinoza
Moved On
 
Join Date: Dec 2011
Location: Galveston
Posts: 417
Stevesleds Luxeon. $2.99 each and amazing customer service with fast shipping.

The combo of 2:1 Luxeon Royal Blue to Luxeon 2700k warm whites (Or 3:1 if you like the deeper blue look) is the best looking LED combo I have ever seen, and FAR better then any premade fixture I have ever heard of.

The basic rule of thumb was 1 3w LED for 15-20 square inches of surface area up to 24" deep. However, that was for Cree XT-E and XP-G driven at a max of 700mA.

The modified rule of thumb would look like this:

1 XT-E/XP-G Cree driven at 700mA per 15-20 square inches of surface area up to 24" deep

Or

1 XT-E/XP-G Cree driven at 1300mA per 22.5-30 square inches of surface area up to 24" deep

Or

1 Phillips Luxeon driven at 1000mA per 22.5-30 square inches of surface area up to 24" deep


So for a 30 gallon tank 14 Luxeon Royal Blues and 7 Luxeon 2700k Warm whites would be perfect.

Here is a post about me doing 20 LEDs in a perfecto style hood for a 29 gallon tank. its a bit ghetto (the person I built it for was on a VERY limited budget) but might give you some ideas:
http://www.reefcentral.com/forums/sh....php?t=2192354



Last edited by joelespinoza; 07/20/2012 at 10:02 AM.
joelespinoza is offline   Reply With Quote
Old 07/20/2012, 05:53 PM   #10
Buzz1329
Registered Member
 
Join Date: Jul 2007
Location: Staten Island
Posts: 1,316
Quote:
Originally Posted by undertai View Post
Dose not apply to leds. They are more of a focus light. Putting say like 10 3watt less over a 20 gallon tank. Is like putting a 250w mh light over your tank with a lot less heat.
By this logic, wouldn't a 1 watt LED be sufficient to light a 120 gallon SPS tank?


Buzz1329 is offline   Reply With Quote
Old 07/20/2012, 06:13 PM   #11
bnumair
Dr. Reef at ur service
 
bnumair's Avatar
 
Join Date: May 2009
Location: Tulsa, Ok, USA
Posts: 7,354
Blog Entries: 14
that rule does not apply to LED's. if what Buzz1329 said was true then a single 120w Led unit will not be enough for a 120 gal. LEDs are mostly directional with not much wide angle light structure. also every LED fixture has its own par reading and work/act differently.
with LED's mostly coverage is the big issue than wattage.


__________________
Water Quality: NO3 0,Phos 0,Cal 440,Alk 7.5,Mag 1300

"Reef Fast, You Crash, Reef Slow, You Pass" Mike's Reef 3:16

Current Tank Info: 350g DT,95g sump, 50g Frag tank, 4800gph return 4x Sea swirls. 6x AI Vega Color. 200# Pukani rock, dual recirculating skimmer, Biopellet, GFO Carbon rx's, Cal rx. Closed loop. 1.5hp chiller, genesis renew. Apex & RKE
bnumair is offline   Reply With Quote
Old 07/20/2012, 06:22 PM   #12
undertai
Registered Member
 
undertai's Avatar
 
Join Date: Sep 2004
Location: Alameda, CA
Posts: 926
Quote:
Originally Posted by Buzz1329 View Post
By this logic, wouldn't a 1 watt LED be sufficient to light a 120 gallon SPS tank?

I wasn't saying that if you put the 10 leds only over this tank that it would be. Equal to that 150w mh. Used a par30 bulb with 5 3w leds over a 10 gallon manor tank. And everything was fine my sps, lps, and bta. And the leds were driven at 2 Watts each. That's 10 watts and the par at the bottom of my tank was higher than the 150w de I had. The light is more focused with the lens. Creating greater par near the bottom of my tank. The 150w was higher up maybe 3inches higher. Even with the mh at the same height more heat was put into my tank But par was about 50 to 25 points higher near bottom of my tank. Bug the trade off is I can run my lights all day instead of having my mh turn off during the daytime when temp gets above 82.

Sent from my SPH-D710 using Tapatalk 2


undertai is offline   Reply With Quote
Old 07/20/2012, 06:27 PM   #13
undertai
Registered Member
 
undertai's Avatar
 
Join Date: Sep 2004
Location: Alameda, CA
Posts: 926
Say if you need 50 3w leds , you would need say like 100 1w leds to get the same amount light. Just a guess! But some of the first commercial led lights used 1w leds. Compared to most newer ones running 3w or higher less. I think ecotech runs 10w or 30w leds

Sent from my SPH-D710 using Tapatalk 2


undertai is offline   Reply With Quote
Old 07/20/2012, 06:35 PM   #14
pwreef
Registered Member
 
Join Date: May 2011
Location: New York
Posts: 517
Ecotech Radion uses 3W LEDs, some of which run at 5W. The point of LED fixture design is to make it as reliable and economical to run and manufacture as possible. Sure its possible to light a tank with 1W or 1/2W LEDs, but the most efficient LED emitters in terms of lumens per Watt happen to be the 3W. Having to solder and interconnect 3 times as many LEDs, while decreasing the overall fixture efficiency hardy makes sense.


__________________
Since May 2011: 57G rimless Deep Blue, Lifereef skimmer/sump, JBJ ATO, RKL, DIY LED using reefll.com 12-up boards
pwreef is offline   Reply With Quote
Reply

Thread Tools

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 On

Forum Jump


All times are GMT -6. The time now is 04:58 AM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Use of this web site is subject to the terms and conditions described in the user agreement.
Reef CentralTM Reef Central, LLC. Copyright 1999-2014