What spectrum should moonlight be?

[Miami Reef]

My Reefi Unos have a moon setting that adjusts the intensity based on the real moon cycle.

I need to pick the moon’s spectrum. Should it be the royal blue, 395 nm, cool white, different channel, or a mix of certain ones?

@Thales

 

[Miami Reef]

Here are the color channels.

 

[Tripod1404]

My Reefi Unos have a moon setting that adjusts the intensity based on the real moon cycle.

I need to pick the moon’s spectrum. Should it be the royal blue, 395 nm, cool white, different channel, or a mix of certain ones?

@Thales

Set it to something that you like the looks. They are not providing something natural, so it won’t mater.

Real moon light is very very dim and basically has the same spectra of sunlight (but is slightly red shifted).

 

[JonoH]

I have a similar function set on my AI Hydra's - from memory I used either Violet or Blue on about 1-2%.

 

[Miami Reef]

Thanks guys! I used the 395 nm spectrum. I like that for the moonlight.

 

[rishma]

I fell down the rabbit hole a couple months ago on moonlight spectrum. Long story short, it’s very warm/low kelvin at the surface and gets filtered rather quickly leaving only blue/royal blue spectrum with a little of the near UV if simulating a shallow reef. From those three channels, Royal blue would be the most present, followed by blue, then UV. The deeper you simulate the more it shifts to only Royal blue.

Also keep in mind the Reefi uno won’t illuminate an LED below 1 Lv so depending what you set it at you may not get a full moon cycle. It will be dark for longer periods the lower you set it.

I am not sure how sophisticated the Reefi moonlight program is, but I assumed it’s a cosine based function which fits the moon cycle pretty closely. Here is a chart I made to determine how much off time the moonlight is illuminated depending on set point in the program.