Wow, I use one of those Arcadia lights in my DT to add flickering to the sand bed, it's stuck to the right hand side of the light lens and is on a timer, looks like natural moon light when on.
I also have the same media rack as Tok but I use a D&D nano glo led, it's just 4w consumption with next to no heat and comes on via a timer 5 mins before DT light go off and stays on for 5 mins after DT main light come on keeping the possible swing in PH to a minimum. I tested my tank PH after DT lights were off for 4 hours and PH was still 8.2.
The nano is £45 online and grows cheato brilliantly as its the right temperature 6500k perfect for algae growth. It also fits the RSM 250 chamber perfectly as if it was made for it. It just rest on the tope of the media rack and bracket of my deltec.
NANO-GLO Refugium LED | The Aquarium Solution
Light Housing DIMS: 3.25” x 0.75”x 5”
Inside Magnet DIMS: 3.25” x 0.75”x1.75”
Light Output: 70 Lumens per LED
Kelvin: 6500K Daylight
Power: 4 x 1 Watt LEDs
BTW cheato growing like mad currently. Tang isn't going hungry.
