Go Back   Aquarium Advice - Aquarium Forum Community > General Aquarium Forums > General Hardware/Equipment Discussion
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 05-21-2013, 04:39 PM   #891
Aquarium Advice Addict
 
TommyP's Avatar
 
Join Date: Oct 2012
Location: Long Island, NY
Posts: 1,227
Quote:
Originally Posted by Ingy View Post
As I said, that was the mathematical formula. As the 55 is a real narrow tank front to back, if you raise it above the 2.6", there will be more light spillage. If course you can move them back a bit, increasing the gap in front, allowing you to raise the light and avoid spillage in the front.
This formula is just to give an idea what will happen. Raise the light 10" and you may be blinded yourself from light spill. Salt creep shouldn't be too much of a problem if there is a cover over the leds. My T5 hang about 3" over the tank and there is no issue a wipe every month or 2 cant solve. But, as I said, it's just a starting point.
Gotcha. Thank you.
__________________

__________________
Salt Life
55g Reef tank
30g Freshwater tank
TommyP is offline   Reply With Quote
Old 05-21-2013, 06:37 PM   #892
Aquarium Advice Addict
 
Gti_Leo's Avatar


 
Join Date: Jan 2011
Location: Toronto,Ontario
Posts: 3,021
Quote:
Originally Posted by Daniel Fishy View Post
I have mine 6" apart and 10" above water line. 2.5" seem low and would most likely get salt creep and wet. Great spread and more than enough light. I was going 8" but glad I went 10".
not to mention burnt corals and spotting and a lack of spread of the different colors

rapid LED has their LED university which offers good info of optics an fixture heights
__________________

__________________
Gti_Leo is offline   Reply With Quote
Old 05-21-2013, 06:44 PM   #893
Aquarium Advice Addict
 
Gti_Leo's Avatar


 
Join Date: Jan 2011
Location: Toronto,Ontario
Posts: 3,021
Quote:
Originally Posted by Ingy View Post
As I said, that was the mathematical formula. As the 55 is a real narrow tank front to back, if you raise it above the 2.6", there will be more light spillage. If course you can move them back a bit, increasing the gap in front, allowing you to raise the light and avoid spillage in the front.
This formula is just to give an idea what will happen. Raise the light 10" and you may be blinded yourself from light spill. Salt creep shouldn't be too much of a problem if there is a cover over the leds. My T5 hang about 3" over the tank and there is no issue a wipe every month or 2 cant solve. But, as I said, it's just a starting point.
then all you need is a thinner heat sink.

i would not put a rapid LED fixture that close to the water surface, these LEDs ar incredibly powerful and like greg mentioned hes getting 400 PAR at the bottom of a 16" deep tank with his fixture 18" above the tanks wit h60 degree optics. this is alot of punch from a single unit which im guessing is over a 40 gallon. any closer and i don't see anythign other then high light stony corals lasting.

also not a good idea as it leaves you less workign space and the heat that will come off the heatsink has more of a risk of heating up the water then if they are further away
__________________
Gti_Leo is offline   Reply With Quote
Old 05-21-2013, 07:33 PM   #894
Aquarium Advice Addict
 
Gregcoyote's Avatar



Tank of the Month Award
 
Join Date: Feb 2011
Location: Columbia, Missouri
Posts: 8,321
Quote:
Originally Posted by Gti_Leo View Post
then all you need is a thinner heat sink.

i would not put a rapid LED fixture that close to the water surface, these LEDs ar incredibly powerful and like greg mentioned hes getting 400 PAR at the bottom of a 16" deep tank with his fixture 18" above the tanks wit h60 degree optics. this is alot of punch from a single unit which im guessing is over a 40 gallon. any closer and i don't see anythign other then high light stony corals lasting.

also not a good idea as it leaves you less workign space and the heat that will come off the heatsink has more of a risk of heating up the water then if they are further away
It's actually two fixtures over a 6' long approx. 90 gallon. And I have an intentional darker are in the middle where the bracing is. I use that to acclimate new corals. Otherwise I would have used 3 fixtures for coverage of a 6' long tank. They can be had with wider angle lenses like 90 or even 120 degree I believe. That would greatly reduce the distance they need to be above the tank for proper coverage. As they are very powerful, if you can't raise them higher to break the corals in, I highly suggest a dimmable unit. In a pinch you can use sheets of diffusing material to cut the light back.
__________________
Gregcoyote is offline   Reply With Quote
Old 05-21-2013, 08:20 PM   #895
Aquarium Advice Addict
 
Gti_Leo's Avatar


 
Join Date: Jan 2011
Location: Toronto,Ontario
Posts: 3,021
Quote:
Originally Posted by Gregcoyote View Post
It's actually two fixtures over a 6' long approx. 90 gallon. And I have an intentional darker are in the middle where the bracing is. I use that to acclimate new corals. Otherwise I would have used 3 fixtures for coverage of a 6' long tank. They can be had with wider angle lenses like 90 or even 120 degree I believe. That would greatly reduce the distance they need to be above the tank for proper coverage. As they are very powerful, if you can't raise them higher to break the corals in, I highly suggest a dimmable unit. In a pinch you can use sheets of diffusing material to cut the light back.
my bad when you said 16" deep i assumed, not thinkign it may be a odd dimension tank
__________________
Gti_Leo is offline   Reply With Quote
Old 05-21-2013, 08:24 PM   #896
Aquarium Advice Addict
 
Gregcoyote's Avatar



Tank of the Month Award
 
Join Date: Feb 2011
Location: Columbia, Missouri
Posts: 8,321
Quote:
Originally Posted by Gti_Leo View Post
my bad when you said 16" deep i assumed, not thinkign it may be a odd dimension tank
No, you were right, it is 16" deep, just long.
__________________
Gregcoyote is offline   Reply With Quote
Old 05-21-2013, 08:33 PM   #897
Aquarium Advice Addict
 
Gti_Leo's Avatar


 
Join Date: Jan 2011
Location: Toronto,Ontario
Posts: 3,021
Quote:
Originally Posted by Gregcoyote View Post
No, you were right, it is 16" deep, just long.
was it custom built for you?




Dimmable Onyx by Rapid LED - Rapid LED

for all those lookign for an non DIY dimmable low cost fixture
__________________
Gti_Leo is offline   Reply With Quote
Old 05-21-2013, 08:36 PM   #898
Aquarium Advice Addict
 
Gregcoyote's Avatar



Tank of the Month Award
 
Join Date: Feb 2011
Location: Columbia, Missouri
Posts: 8,321
Quote:
Originally Posted by Gti_Leo View Post
was it custom built for you?

Dimmable Onyx by Rapid LED - Rapid LED

for all those lookign for an non DIY dimmable low cost fixture
No, it's a pretty common glass aquarium.
I used the pre-built Onyx fixtures. Would have bought the dimmable ones but they weren't available then. No worries as I had plenty of room to raise them on chains as needed.
__________________
Gregcoyote is offline   Reply With Quote
Old 05-21-2013, 08:41 PM   #899
Aquarium Advice Addict
 
Gti_Leo's Avatar


 
Join Date: Jan 2011
Location: Toronto,Ontario
Posts: 3,021
you could also just turn down the output current of the drivers to lower the output of the LEDs strings
__________________
Gti_Leo is offline   Reply With Quote
Old 05-21-2013, 10:23 PM   #900
Aquarium Advice Addict
 
Gregcoyote's Avatar



Tank of the Month Award
 
Join Date: Feb 2011
Location: Columbia, Missouri
Posts: 8,321
Quote:
Originally Posted by Gti_Leo View Post
you could also just turn down the output current of the drivers to lower the output of the LEDs strings
It usually requires a PCM style driver to safely dim most LEDs. They didn't include that type of driver in the first Onyx fixtures.
__________________

__________________
Gregcoyote is offline   Reply With Quote
Reply

Tags
light, lighting, reef

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








» Photo Contest Winners








Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 09:52 PM.


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