Does LED cool white harmful to acropora.

[vpoiu1263]

So far I still dont know how to set my led channel in my sps tank.
I heard that cool white cant switch too strong ,or it will cause some kind of unexpect problem .
How you setup your cool white Led to your sps tank.

Now I am set white 60%, blue 92%, purple 92%, red/green/warm white 24% ,on my maxspect RSX with two ati blue plus.

 

[Flippers4pups]

So far I still dont know how to set my led channel in my sps tank.
I heard that cool white cant switch too strong ,or it will cause some kind of unexpect problem .
How you setup your cool white Led to your sps tank.

Now I am set white 60%, blue 92%, purple 92%, red/green/warm white 24% ,on my maxspect RSX with two ati blue plus.

Bump. Let's see what others think.

I personally run quite a few "cool white" LED's in the modded Mars Aquas. 14000k -20000k's with actually very good results. Everyones tank is different and your lighting is different than mine, but you should have no problems with that fixture.

Get your hands on a par meter to adjust your intensity. Most corals will do very well with 200-300 par.

 

[29bonsaireef]

Not too familiar with that LED. I had black boxes over a frag tank for about 2 years. Ran 100% blues 100% whites, no issues. I did have the lights hung way high, like 24-26" over a 12" tank. I don't think the white LEDs are bad. I just think many times users hang them too low or go too high of an intensity for what their tank and corals can handle ATM. IMO, add some more T5 bulbs and just use the LED to add some shimmer and pop.

 

[vpoiu1263]

Bump. Let's see what others think.

I personally run quite a few "cool white" LED's in the modded Mars Aquas. 14000k -20000k's with actually very good results. Everyones tank is different and your lighting is different than mine, but you should have no problems with that fixture.

Get your hands on a par meter to adjust your intensity. Most corals will do very well with 200-300 par.

Thanks .
I really want to test my par intensity, but I dont have a parmeter neither my friends close to me.

 

[Flippers4pups]

Thanks .
I really want to test my par intensity, but I dont have a parmeter neither my friends close to me.

Get your hands on a lux meter and do the conversion to par. Lux meters are pretty cheap. I've done this before. It will get you close.

I'll have to find the article on the conversion.......

 

[Flippers4pups]

Found it:

https://www.advancedaquarist.com/2013/2/equipment

Lux to par conversion table.

 

[ihavecrabs]

I've purposely switched out cool white for warm white bulbs in my fixtures. Mostly to get a different visual appearance. I have about half of them at 10k and the other half at 3.5k.

I also removed the red/greens and replaced with warm white LEDs since that provides enough of that spectrum anyway.

I think the corals will adapt either way.

 

[AdamNC]

Thanks .
I really want to test my par intensity, but I dont have a parmeter neither my friends close to me.

https://www.reef2reef.com/threads/maxspect-rsx-200w.516010/#post-5426537

I just measured par last week with a Seneye.

With the settings I have listed above:

6” below water line 280 -300 par

Mid tank 180 - 220 par

Sand bed 80 - 100 par

 

[Graffiti Spot]

The best led tanks I have seen had their lights hung high over the tank and used whites at 100 percent and had both white and cool white leds. Most of them had a lot of leds to cover the tank too. Check out robert chu's tank it was tank of the month sept 2013. This is a extreme example of high hung leds. I went to his house to buy some frags and talk reefing when he still had his tank setup. It was beautiful and the coral colonies were massive for being in a 75 gallon led tank, they also spawned in his tank. There are advantages to hanging them high up and using extra bulbs or fixtures.

 

[vpoiu1263]

The best led tanks I have seen had their lights hung high over the tank and used whites at 100 percent and had both white and cool white leds. Most of them had a lot of leds to cover the tank too. Check out robert chu's tank it was tank of the month sept 2013. This is a extreme example of high hung leds. I went to his house to buy some frags and talk reefing when he still had his tank setup. It was beautiful and the coral colonies were massive for being in a 75 gallon led tank, they also spawned in his tank. There are advantages to hanging them high up and using extra bulbs or fixtures.

Ok， thanks for your nice reply, I will try to hang my light system as high as possible , and get the all channal to high power out put.
Then seeing the corals condition carefully.

 

[lariat8099]

If you have a IPhone. Get the Luxmeter app. It works well for light at the surface

 

[markalot]

I don't think any particular LED harms acros, though cool whites are hideously ugly. The problem is with the overall spectrum when people tweak lights to look good to our eyes. T5's and Halide have a very narrow peak in the green spectrum, where our eyes are super sensitive, so they tend to look white even though the actual spectrum is very blue heavy. Hang a typical LED fixture above a tank and adjust it so things look similar and you are flooding the tank with too much white light because LED doesn't have that nice narrow green peak. Putting numerous LED fixtures above a tank seems to solve the problem, I suspect simply because our eyes are less sensitive to blue so with more fixtures the resulting spectrum becomes more blue as the white channel on each individual fixture doesn't have to be turned up as much for it to look good to our eyes. Or something like that.

I have warm white, cool white, Lime, and Mint in various fixtures above my two tanks. In my opinion Lime is better than either white but Mint is probably the best for looking similar to a good T5 combo, when paired with cyan, blues, and violets.

Get a PAR meter or rent one, there is no easily reliable LUX conversion since LUX is weighted to match our eyes (green sensitive). Just look at those equations and the warnings. Compared to how much we pay for corals a PAR meter is cheap, and BRS has started renting them as well, providing us a cheaper option.