Maybe you have too much light coming from the Radion?...I went from a 200W PS BP LED fixture, to the two Radions...I ran the PS @ 90%, I put the Radions over the tank initially at 90% @ the same height and burnt a couple coral right away...I now run My Radions at a max Of 60% for about 3 hrs a day... everything is growing fast and happy.

Those are peculiar results as the PAR test's I have read rank the AI to be higher than the Radion (Having the Radion @ a lower intensity should only compound this effect). If less light is getting to the zoas then they should become more expanded, they shouldn't close due to photo shock.

Anything else change in the tank or anything that could be irritating them? Have any photos?

Gah, I need a PAR meter to get some actual numbers here as what the box say's and what others are measuring seem to be different.

I am not saying AI are garbage either. I was going to go with Vertex Illumina or AI until the Radions came into the picture and myself like many others prefer the Radion over the AI. Different strokes for different folks I guess one could say.

I figured since radions are almost double the power of ai I'd lower it in the beginning. But I have Zoas in the tank just totally under the sols and they're wide open and expanding.

I guess in a few days I'll have my answer now that I've swapped the lights

I'll take photos tonight

Before any LEDs I had 4x250 mh and 4x 39 t5

I was going to buy a PAR meter but now I'm looking for a Spectrograph so I can measure the PUR which doesn't show up with the PAR meter...

I was also running 250w MH and T5 before switching to the PS LED,...I started the PS fixture @ 50% and slowly worked my way up to the 90%...then I assumed the Radion was less W Than the PS and there should be no shock when switching the two LED fixtures as previously stated above...I was wrong... LED's are really new in this hobby and from what I have read, we are making a mistake by measuring LED fixtures with PAR....PAR undergrades the blue light spectrums and focus's more on the white/yellows...Higher end LED's used for reef lighting have no yellow as fould in traditional lighting (MH, T5, PC etc) thus measuring in PAR is old tech and not the correct tool for the job when measuring LED...this is also why less expensive 1W LED show more PAR, they have more yellow spectrum to measure yet this yellow is not usable light in reef corals...I think we'll see more about PUR (as oposed to PAR) as the LED fixtures become more common place in this hobby...


Stolen quote:

So how do you really measure the light then if par is irrelevant? I am just wondering cause I am getting an AI for my new tank, and going from t5's to AI will be a huge change, I know I have to start it low, but how low is low lol? might seem like a dumb question

Thanks for the post Cale, that clears up some misconceptions in my head!

It's been the opposite in my world. Every person that I've demonstrated the lightning storms to has looked at me like there's something wrong. Then when I explain, several have asked if the fish are harmed by this. Uhhh.... pretty sure there is lightning in nature.