Another reason to use Metal Halides :)

[Young Frankenstein]

UV, LED's don't produce much needed UV, a metal halide even in the glass jacket produces much needed UV let me just runnnnnnnnnnn out of here now, i expect to get chased by the LED people anyway

 

[Scoly]

U can run, but u can't hide!!

 

[MattL22]

Gotta be honest I use LEDs on an sps tank and they r ok but if I had the $ I'd switch to t5s if I heat was not an issue I'd 100% use MH

 

[FaviaFreak]

We know what Castle you reside in so you can't hide

 

[ritter6788]

[video=youtube;yq1KeyEARBU]http://www.youtube.com/watch?v=yq1KeyEARBU[/video]

 

[cparka23]

So how much UV radiation is necessary to grow corals?

 

[FaviaFreak]

[video=youtube;yq1KeyEARBU]http://www.youtube.com/watch?v=yq1KeyEARBU[/video]

hehehehe

 

[Rockadile]

So how much UV radiation is necessary to grow corals?

none

 

[ritter6788]

so how much uv radiation is necessary to grow corals?

zero!

 

[Young Frankenstein]

you are lucky somehow my pc is slow because my kid is using x box goggle it running again yeeeeeeeeeehaaaaaaaaaaa yehhhhhhhhhhha ...........runnnnnnnnnnnnn

 

[Rockadile]

I did and it says UV is damaging to DNA and is why coral produce pigments to block it.

 

[Rockadile]

UV (or UV in synergy with high PAR, temperature, etc.) is known to inhibit photosynthesis. Glynn et al found a combination of high temperature (31°C) and high UV (A & B, 25-30% of direct exposure) caused a high mortality rate among Acropora vallida specimens (significantly more Pocillopora specimens survived this treatment). Lewis (1995) suggests that the zooxanthellae in the stony coral Montipora verrucosa may be damaged by exposure to ultraviolet radiation. Shick (1991) reported that the octocoral Clavularia (commonly called Star Polyps by hobbyists) exhibited a 50% decrease in photosynthesis when exposed to “high” levels of UV-A and UV-B. Hohlbauch (1995) reported the same effect on the Plate coral (Fungia scutaria). Gleason and Wellington (1992) used an underwater spectroradiometer to determine that increased dosages of UV could induce bleaching (loss of zooxanthellae) in the stony coral Montastrea annularis. UV was found to reduce the amounts of photosynthetic pigments and cause photoinhibiton (a reduction in the rate of photosynthesis) in the red alga Porphyra leucosticta (Figueroa et al, 1997). Donkor and Hader (1997) found that UV-B radiation caused bleaching of photopigments in the cyanobacterium Phormidium. The list of references could go on and on. It should be sufficient to say that ultraviolet radiation is potentially harmful to natural and captive ecosystems.

 

[Young Frankenstein]

UV (or UV in synergy with high PAR, temperature, etc.) is known to inhibit photosynthesis. Glynn et al found a combination of high temperature (31°C) and high UV (A & B, 25-30% of direct exposure) caused a high mortality rate among Acropora vallida specimens (significantly more Pocillopora specimens survived this treatment). Lewis (1995) suggests that the zooxanthellae in the stony coral Montipora verrucosa may be damaged by exposure to ultraviolet radiation. Shick (1991) reported that the octocoral Clavularia (commonly called Star Polyps by hobbyists) exhibited a 50% decrease in photosynthesis when exposed to “high” levels of UV-A and UV-B. Hohlbauch (1995) reported the same effect on the Plate coral (Fungia scutaria). Gleason and Wellington (1992) used an underwater spectroradiometer to determine that increased dosages of UV could induce bleaching (loss of zooxanthellae) in the stony coral Montastrea annularis. UV was found to reduce the amounts of photosynthetic pigments and cause photoinhibiton (a reduction in the rate of photosynthesis) in the red alga Porphyra leucosticta (Figueroa et al, 1997). Donkor and Hader (1997) found that UV-B radiation caused bleaching of photopigments in the cyanobacterium Phormidium. The list of references could go on and on. It should be sufficient to say that ultraviolet radiation is potentially harmful to natural and captive ecosystems.

Thats from the enviromental depletion of ozone it says allot of uv is harmull

 

[thewackyreefer]

There are many, many people growing all types of corals successfully under LED's. Sorry.

 

[Rockadile]

Really?
Ultraviolet Light, Marine Aquariums and Coral Reef Aquarium Tank, Stand, Canopy, and Aquarium Filter System

 

[Reef Breeders Verified Sponsor]

UV, LED's don't produce much needed UV, a metal halide even in the glass jacket produces much needed UV let me just runnnnnnnnnnn out of here now, i expect to get chased by the LED people anyway

Ever heard of UV LEDs? Any spectrum can be created with LEDs, so no, that is not an issue

 

[Tabasco1]

[video=youtube;yq1KeyEARBU]http://www.youtube.com/watch?v=yq1KeyEARBU[/video]

That's good stuff right there!

 

[Headiesheradon]

so what if you run leds and then have a metal halide come on for 3-4 hours right in the middle of the day? Been doing that for a year now and welll all i have to say is nananayy boo boo i grow faster than you do!!!! i think i will just sit here and smile with my fast growing everything heheheheheheh!!!!!

 

[Reef Breeders Verified Sponsor]

And also, UV light is more harmful than helpful. Anything mh can do, LEDs can do better using less than half the power.

 

[Headiesheradon]

who says you have to choose just one? think out side the pyramid