Since you already have that one why not try covering up half the LEDs with paper or tape or something so they don't let any light through and see how that works. Depending on how it looks you can then cover or uncover more lights till you get the effect you like and you'll know how many is god
Konton please keep us posted as to what you find that works.
I have 2 tanks 18x18x24 side by side and I too was thinking of a blue moon light LED strip for a couple hours after lights out and couple b4 lights on.
But since I am still working on the inside of the tanks havent looked much into the LED Strips.
Just an FYI most t5HO light kits that have the LEDs only have 4 leds spaced apart prety far.
How much do the Reptile Night Sky LED lights run? I tried to find them online but couldn't get a price.
Luckily I noticed sometimes I wasn't given an operating voltage range on this Waterproof Flexible Light Bar because it could be used with a dimmer switch. So I brought voltage down in intervals as a test. The results at 4.5 volts were pretty good.