How long to run refugium light?

[Jvesche20]

I was reading some people say to run their light 24/7 while others say 12 hrs. Really not sure how long to run it for. I added some chaeto to my refug just don’t know how long to run the light for. I got a 19W led bulb

 

[PDR]

8-12 hours is a decent starting point. You don't want to run it 24/7.

 

[Barry_Cuda]

I've seen posts from several people who run theirs in opposition to the main tank's lighting schedule, to help maintain a more constant pH. That's what I'm doing until I find a reason to do otherwise.

 

[cracker]

I run my light 16 hrs on 8 off.

 

[Scrubber_steve]

I've seen posts from several people who run theirs in opposition to the main tank's lighting schedule, to help maintain a more constant pH. That's what I'm doing until I find a reason to do otherwise.

More to the point, it maintains oxygen

 

[Scrubber_steve]

I was reading some people say to run their light 24/7 while others say 12 hrs. Really not sure how long to run it for. I added some chaeto to my refug just don’t know how long to run the light for. I got a 19W led bulb

I have read people who run them 24/7.
What should determin your photo period duration is inorganic nutrient levels more specifically NO3.
Longer illumination means more photosynthesis means more inorganic nutrient assimilation & lower levels.
Start at 12 hours & increase if you want lower NO3, or reduce if you want higher NO3.

 

[LagoonLounge]

I keep mine opposite to DT as it helps keeps ph in check