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Old 07-22-2010, 09:42 AM   #11
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Quote:
Originally Posted by ragunnaath View Post
Pat, thank you for your suggestions!

I agree with you on the lighting requirement, I think the calculation works upto 6 x 80W T5. If I'm not wrong, my tank would require 450W of light @ 4.5W per gallon considering I would want to go for the corals that need high lighting.

I'll look into the option of DIY light canopy. I think its a good suggestion considering the benefits.

-Ragu
Watts/gallon is kind of an antiquated idea for how to light a reef. It is a good starting point, but you have to consider a lot of other things.
Lets use a 50 gallon tank as an example:
If you have a power compact fixture with 4 96w bulbs over it, you are looking at around 7.7 w/g. Compared to a quality 250w MH fixture, you are looking at around 5.

I don't think anyone here would steer you onto that PC fixture before the MH. You have to take into effect their lighting intensity, and even though it may be less watts, it is more intense and has a higher PAR value. PAR gets tossed around in reef a lot, but it stands for Photosynthetically active radiation. It has been found to be the most accurate way to measure the amount of lighting used by corals and all types of photosynthetic plants/animals. Actually measuring PAR is difficult, there isn't really an economic meter for the individual, but some research around and you will be able to find others PAR values.

Sorry its early and I'm rambling.

Quote:
Originally Posted by ragunnaath View Post
Has anyone thought about LED lighting. I have been reading on some sites that LED lights can be used for a reef setup as well.

LED Saltwater Aquarium Lights - LED Saltwater Aquarium Lights

Any suggestions around this?

-Ragu
I just finished my LED light fixture last night as it were. Check my sig for details on the build, I custom made it. LEDs are awesome for smaller and shallower tanks, but once you get past a certain threshold, you are looking at huge amounts of money to be able to cover any given space. For the larger and deeper tanks, I still think MH are the best.

My brother wrote up a big thing on lighting somewhere, I'll see if I can find it for you.
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Old 07-22-2010, 09:49 AM   #12
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Thanks Cmor! Any idea if such a setup can be accomplished via a DIY approach? These units are not available in India and its going to cost a fortune if I'd have to import them.

LED light strips are available here, but not sure if its the same as ones used in a Pacific Sun product. Would you know of any specs that I should look out for?

Wow,.. those rules are precise and to the point! Thanks Cmor! Will surely keep them in mind!

-Ragu
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Old 07-22-2010, 09:49 AM   #13
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Lighting Article
It has information from, nice basic info to way too much info. lol.
Keep in mind its 2 years old, a lot has changed, but the basic overview and a lot of the things discussed there still apply.

If I were you, I would be shooting for something like 2 250w MH bulbs with 2-4 bulbs of T5 supplementation. But im a coral nut, 2 150w bulbs would be nice as well.

For DIY:
http://www.hellolights.com/index.asp...TS&Category=14
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Old 07-22-2010, 10:05 AM   #14
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Hey.. thanks Jimbo! Wow,.. you guys are awesome.. you're always on the fourm. I never expected such quick responses to my querries. Thanks a ton!

Now, your theory on the PAR thing went over my head... LOL! But yeah I did some reading and can see what you are saying and makes sense.

I checked out your DIY LED project and its NEAT! Well done! Dont you think I could acheive the same performance with more no. of LEDs stacked together? My tank is about 20" tall. It would have about 2" of sand. So, ideal water depth would be 18". What do you think?

Also, can you give me some specs on the LED that you have used? Can you point me to a link where I can get more details? I'd like to see if those are available here.

Thanks for all the help!

-Ragu
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Old 07-22-2010, 10:23 AM   #15
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Hey Jim... sorry for the premature question in my last post. I missed to notice your mention on the LED model. I've googled for 6 Cree XP-G and I'm already reading through the specs. Thanks again!

-Ragu
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Old 07-22-2010, 10:44 AM   #16
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No worries man. Let me know if you have any questions.
LED Drivers - Constant Current Drivers - LuxDrive - LED Supply.com
They have all the individual spec sheets for LEDs there. Common models people use are the XR-E's and then what I used, the XP-G's and the XP-E's.
Some good LED info:
Ultimate LED guide - Nano-Reef.com Forums
Tons of example builds:
Comprehensive DIY LED Project List - Nano-Reef.com Forums

As for if it would be the best option for you, I'm unsure. Anything above 30 gallons as it pertains to LEDs and I'm a little out of my league. There is a 75g build in those examples, you might want to look and see what they did. If you have any general questions, feel free though.
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Old 07-22-2010, 10:48 AM   #17
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No worries man. Let me know if you have any questions.
LED Drivers - Constant Current Drivers - LuxDrive - LED Supply.com
They have all the individual spec sheets for LEDs there. Common models people use are the XR-E's and then what I used, the XP-G's and the XP-E's.
Some good LED info:
Ultimate LED guide - Nano-Reef.com Forums
Tons of example builds:
Comprehensive DIY LED Project List - Nano-Reef.com Forums

As for if it would be the best option for you, I'm unsure. Anything above 30 gallons as it pertains to LEDs and I'm a little out of my league. There is a 75g build in those examples, you might want to look and see what they did. If you have any general questions, feel free though.
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Old 07-22-2010, 10:49 AM   #18
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I'm not sure why that double posted. Could someone delete that, and this?
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