LED 24hr light cycle impact on corals

[Sigmund]

Just curious if anyone had any experience / knowledge with LED lights on a 24hr light cycle where at night the lights go down to a dim, but not completely off.

I have an LED light on my nano tank, and all of my corals were doing fine with it for the first few weeks I had it, the last couple of days I noticed some of my zoas and my ORA Red Gonipora were not opening up. Moved some of them around, changed the flow in the tank and no response. Had not had this problem before with my power compact florescent lighting on a timer. So I started to wonder if the fact that I no loger had any time period where there was no light was affecting the corals. The last two days I have shut the lights down completely at night, and now the corals are opening up back fully in the morning.

Is this just a coincident? Has anyone had similar experiences or any answers.

 

[Andyjs]

I run the LEDs on my Biocube at night and don't have any problems with my zoas and mushrooms. How many LEDs are you running and how bright are they?

 

[Sigmund]

Andyjs,

Sunbrite Slimline LED

7 x Cree XPG white. 3 x 440nm, 2 x470nm.

A standard timer is build in to the remote control unit, once you press it the clock will set at 12.00PM.
Sunrise will starts at 6.00am, it turn on 1 led every 15min. Started with 440nm>470nm>white.
Sunset starts at 5.00 pm, starting to shut down the white LEDs every 15min. White> 470> 440.
When all the LEDs are off, it will jump to the moon light mode automatically. Only the 440 and 470 become active at app 0.1 watt each.

The Zoas for the most part have been only mildy affected, the ORA Red Gonipora did not open at all for a few days. I am now into the third day of turning the light completely off during the moon phase and everything is doing great. This could be a coincident, but seems unlikely to me...

As mentioned before everything was fine with the 24hr cycle for the first few weeks. Mushrooms, Rics, Frogspawn, other polyps have been doing great throughout.