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My problem is the light is pretty bright and it's a HOB refuge/skimmer so the light shines in my bedroom and keeps me awake I know stupid, but that's it LOL so currently I run my refuge lighting during the day when my tank is on about 12 hours total.
Can you tape black construction paper or wrap with s towel, etc to block the light? If you could make something so you can run the fuge light on opposite photo period of your DT it would help keep your ph more stable.
I made a shroud for mine, but it is under the stand. I used a 6" PVC coupling and some angle brackets so the light would be focused on my fuge and not all over the sump. Maybe you could make a cone shaped shroud (like a lampshade) so at least you don't see the light bulb. If not, having your refuge light on during the DT light period is better than no refugium at all.