12w or 16w grow light enough?

**Clownfish Chris** · 05-01-2017

Originally Posted by Luman01

Chris I've had that clam for 10 months now. It has been under 3 different light the 12 watt and I under a 16 watt and also a 11 watt and it's probably grown most likely about half an inch.

Keep up the good work!

**malira** · 05-01-2017

Originally Posted by Luman01

I don't know if this helps or not but I have a 12 watt light over my clam and it grows it!

What light are you using?

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**dragon99** · 05-01-2017

I have this light:
https://www.amazon.com/Floodoor-Ligh...MDMZWH5S61AJYE

According to my Seneye is putting out ~95par @ 6.5in. Seneye thinks it's 10K kelvin, but it's bright pink. Apex says it's pulling 15w.

I'm hoping to get my refugium put together this week or next. I have to drill out the ATO that came with the reefer and do some re-plumbing. Now where'd I leave that motivation....

**malira** · 05-01-2017

Originally Posted by dragon99

I have this light:
https://www.amazon.com/Floodoor-Ligh...MDMZWH5S61AJYE

According to my Seneye is putting out ~95par @ 6.5in. Seneye thinks it's 10K kelvin, but it's bright pink. Apex says it's pulling 15w.

I'm hoping to get my refugium put together this week or next. I have to drill out the ATO that came with the reefer and do some re-plumbing. Now where'd I leave that motivation....

So 6.5 inches below the water it reads 95 par.
How high above the water?
Is that straight down?
How far is the spread of light?

I with you on the motivation thing. I need to clean out my sump with my dry vac before I really get the refugium going.

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**dragon99** · 05-01-2017

Just thru air and that's the reading dead center. Drops off quite a bit to the sides. At 13" it gets 30par across a pretty wide spread though.

PUR is reading 88% which is good.

**malira** · 05-01-2017

Originally Posted by Clownfish Chris

Watts is how much electricity is used to power the device. Par is how much light you have. Yes more watts means more power which means more PAR but there are other variables as well. The efficiency of the diode, the optics, color temperature, etc.

So how much par/pur/watts do you need for a fuge?

I guess I should search. I don't want to spend over $50 for a workable solution.

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**dragon99** · 05-01-2017

Originally Posted by malira

So how much par/pur/watts do you need for a fuge?

I guess it depends on much of a reduction in nutrients you need. BRS compared several lights which gives a good idea of results from different amounts of PAR
https://youtu.be/OKNOfwEUdPs

You can watch the first video too, but here's the PAR breakdown
Capture.jpg