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Old 09/04/2017, 08:15 AM   #276
Ron Reefman
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A 20"x20" tank might look good with a pendant. ReeF-Lab makes a pendant with 50 Cree leds and uses a glass lens so you can focus it down to 24"x24". ReeF-Labs has a webiste and full disclosure, I own one I use over my 24"x24" frag tank and it grows corals very well. If you want to discuss it, you can PM me.

Another option would be one (or two if you want to get crazy) Reef Breeders Photon V2 16" fixture. I have one of these over my 50g cube which is shallower than yours and just a bit bigger (24"x24"x20"). One should do the job even at 30" deep. But two would have you running them at about half power or less but incredible coverage.


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Old 09/07/2017, 05:52 PM   #277
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Good afternoon everyone. After many years i have decided to jump back into the hobby. Its an understatement to say the the equipment has really come a long way. Which leads me to my very novice question (forgive me if its been asked before). I am looking for LED lighting options for my soon to be reef tank which is 48x18x20. I'd like to do fish and soft corals. Amazon has tons of items, and its a bit overwhelming sifting through it all. Does the the old 4 watt per gallon rule still apply?


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Old 09/15/2017, 07:13 AM   #278
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Good afternoon everyone. After many years i have decided to jump back into the hobby. Its an understatement to say the the equipment has really come a long way. Which leads me to my very novice question (forgive me if its been asked before). I am looking for LED lighting options for my soon to be reef tank which is 48x18x20. I'd like to do fish and soft corals. Amazon has tons of items, and its a bit overwhelming sifting through it all. Does the the old 4 watt per gallon rule still apply?
Not at all, leds are a totally different animal.

Any led fixture will work. Over a 20" deep tank the Current Orbit and Marineland fixtures are a bit weak (0.5 watt leds). But any of the others will grow almost any coral.

The issue you need to consider is what features you want to pay for. MarAqua will work fine and they are very inexpensive but have very few features. EcoTech Radions have lots of features and are very expensive (maybe even over priced. Here is a link to a post about the less expensive led fixtures:
http://www.reefcentral.com/forums/sh...&postcount=233


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Old 10/21/2017, 03:23 PM   #279
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Brs has some good info videos about LED lighting, I've got 3 kessil tuna blue over 220 gallon and don't have them go above 60%


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Old 10/22/2017, 06:41 AM   #280
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Brs has some good info videos about LED lighting, I've got 3 kessil tuna blue over 220 gallon and don't have them go above 60%
You have to be a bit careful about the results that BRS draws. Some of there comparisons are fine, like t5 to Radion. But then they extrapolate the results to all leds which is completely absurd. Big led panels like a 32" Reef Breeders Photon V2 is a VERY different animal than a Radion with 2 small pucks as a source for light. So a Radion doesn't bounce much light off the glass back into the tank. I'll wager a Photon V2, or any other 3w led panel fixture, would do much better than the Radion in the same comparison. Their test results are probably spot on, but their conclusions are much to sweeping and over stated.


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Old 11/09/2017, 02:06 PM   #281
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Looking at a LED light for a 75 gallon. Probably not going to have a massive amount of SPS, much more LPS and softies. I don't like the effect of the pendant/puck lights where there is this shimmering in the water; its really distracting. What are some good LED lights that are arranged like a strip, such as this:



Hoping for a price range around $200.


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Old 11/09/2017, 03:27 PM   #282
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First, that fixture is for 12" deep reef tanks and fish only tanks! It has 360 leds and it's only 59 watts! That's less than 0.2 watts/led. Over a 20" deep tank it will keep zoas and softies near the bottom and lps from 12" or less deep in the tank. Forget about sps! You need more wattage, not more leds to penetrate 20" deep.

For $200 you'd be WAY better off with two MarsAqua fixtures that drive 3 watt leds at 1.9 watts/led. Even better, for a bit more would be a 32" ViparSpectra that drives 3 watt leds at 2.2 watt/led.


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Old 11/09/2017, 06:14 PM   #283
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Alright, I took a look at those two, and they both look much better. I have a discount at a LFS, so do you have any recommendations from a standard vendor rather than Amazon?

Maybe I don't understand the watts/LED argument. Say I have two equally efficient lights, each drawing 100W, one with 100 LEDs and one with 36. Why would the one with 100 LEDs perform differently than the one with 36? They supply the same watts of light, and therefore the same PAR.


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Old 11/10/2017, 06:08 AM   #284
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Alright, I took a look at those two, and they both look much better. I have a discount at a LFS, so do you have any recommendations from a standard vendor rather than Amazon?

Tell me what brands and the cost of the fixture your LFS carries and I'll try to help. But many/most LFS don't carry black box Chinese fixtures because they are sold do cheap on Amazon or Ebay that there is no margin for the LFS. The name brands the LFS will carry are either like the Fulval (Current Orbit or Marineland), very weak. Or considerably more expensive. Which is OK if cost isn't an objection. Brands like AI, EcoTech, Maxspect and more.

Maybe I don't understand the watts/LED argument. Say I have two equally efficient lights, each drawing 100W, one with 100 LEDs and one with 36. Why would the one with 100 LEDs perform differently than the one with 36? They supply the same watts of light, and therefore the same PAR.
You are right, you don't understand so lets try to explain it. Taking your example fixtures:

The 100w fixture with 36 leds will be much brighter and the light will penetrate much deeper into the water and even at the surface, create much more PAR. Each led is running at almost 3 watts (think 100w light bulbs).

The 100w fixture with 100 leds is running at 1 watt per led. So not nearly as bright, as powerful or as much PAR (think 10 watt nightlight bulbs). The brighter the individual bulb, the further the light will penetrate (or travel).

Think of it this way, you want to light up the driveway in front of your garage all the way out to the street with lights mounted on the garage. You get to use 1000 watts. Would you rather have ten 100 watt bulbs, or one hundred 10 watt bulbs? The light will be similar at 5 feet from the garage (maybe), but out at 20 feet or 100 feet the ten 100 watt bulbs will be far more effective than the 10 watt bulbs. Right? Does that help?

The 0.2 or even 0.5 watt leds just don't penetrate the water the same as a 3 watt led. And adding more weak 0.2 or 0.5 watt leds isn't going to make the light penetrate any deeper (they are parallel, not cumulative). The 0.5 watt led fixture is OK for a 12" deep tank. Maybe even for an 18" deep tank with easy coral. But a 3 watt led fixture will have way more PAR, 2 to 4 times as much PAR (200 vs 50) at 18" deep with 1/10th as many leds.

If that still doesn't make sense to you, say so and I'll try again. It took me a while to understand as well as I do and there is still more I could learn!



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Old 11/10/2017, 10:22 AM   #285
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The garage door light explanation really helped, thanks!

Alright, let me try explaining it to see if I understand. Its the medium (air or water) which causes this effect, right? I think it wouldn't matter in a vacuum. The medium deflects photons based on how energetic they are. Its sort of like trying to break down a brick wall. An equivalent amount of kinetic energy in either thousands of baseballs or on speeding 18 wheeler; the 18 wheeler is going to be much more effective.


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Old 11/11/2017, 04:35 AM   #286
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You've got the idea. Light travels through air MUCH better than it travels through water, and I believe salt water is even worse than fresh water. As for traveling through a vacuum, I'm not 100% sure. Star light is traveling through a near vacuum and it still fades with distance. But then space isn't a perfect vacuum and the distances are huge by comparison.

And certain spectrum of light travel better through salt water than others. Here is a chart that paints a pretty clear picture.




And here is a chart provided by Current Orbit which is very similar to the Fluval fixture you asked about. They use 0.3 to 0.5 watt leds like Fluval does.

Notice that at about halfway down in a 24" deep tank they get a PAR of 40 or less. Most corals in this hobby need more PAR than that. IMHO even zoas, softies and mushrooms need a PAR of 50 or higher just to stay healthy, let alone grow and propagate. My led fixture is 50" long and covers a 6' long tank. It uses just 88 leds, some are 3 watt and some are 5 watt. I run mine at 90% on 3w blue channels, 40% on 5w white and 3w violet and 10% on the few 3w green and red. With those settings I get a PAR of 190 at 12" deep in my tank. At 100% on all 6 channels (that's what Current Orbit used in their test) I get a PAR of 230. That's almost 6 times what the Current Orbit gets.




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Old 11/15/2017, 05:55 PM   #287
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Originally Posted by wertoiuy View Post
Looking at a LED light for a 75 gallon. Probably not going to have a massive amount of SPS, much more LPS and softies. I don't like the effect of the pendant/puck lights where there is this shimmering in the water; its really distracting. What are some good LED lights that are arranged like a strip, such as this:



Hoping for a price range around $200.
Junk. Had one

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Old 11/16/2017, 06:17 AM   #288
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Junk. Had one
I wouldn't call it junk, it depends on what you want to use it for. If you have a FOWLR or a shallow tank (under 18", preferably about 12") with zoas and mushrooms it can be an OK light.


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