Trouble Keeping Invert / Beginner Corals

[bang guy]

Lux meters are pretty cheap. They are not accurate in how much actual light a bulb produces but they are extremely accurate in measuring how much bulb output changes over time. After using a bulb for a week or so (break in period) measure the lumens. You probably don't need to replace until lumen output drops 25%. You can pick whatever number you want though.

Also, with your variable output you could continue to slowly ramp up the bulb output as the lumens begin to decline.

I'd also suggest to never change out all of your bulbs at the same time.

 

[mandy111]

I

Lux meters are pretty cheap. They are not accurate in how much actual light a bulb produces but they are extremely accurate in measuring how much bulb output changes over time. After using a bulb for a week or so (break in period) measure the lumens. You probably don't need to replace until lumen output drops 25%. You can pick whatever number you want though.

Also, with your variable output you could continue to slowly ramp up the bulb output as the lumens begin to decline.

I'd also suggest to never change out all of your bulbs at the same time.

We have always changed all 8 bulbs at same time. Havnt had any problems ? Why do you suggest not doing it that way ?

 

[bang guy]

Coral takes some time to adapt to lighting. Perhaps your dimmers are mitigating the issue. For the rest of us going from 75% illumination (old bulbs) to 120% (break-in period can be intense) is a monster increase in lighting. It can overload corals and they expel zooxanthellae.

I know you understand the adage "nothing good happens fast", this is a good example.