Viparspectra 165w par help

[maharba-wrx]

So I got two viparspectra 165w over my 75 galon reef tank.. lights both sit 16 inches above the waterline (Glass lid on tank). I run them at 25% blues.. and 1% white for only a few hours a day... my LPS are doing great..
My question is.... would anybody have an idea of what the PAR reading would roughly be on the blues?

 

[MichaelP]

I just tested my 300w over my 40 breeder this weekend.
At 12” above the water I was getting 200 par about 6 inches down and 100-120 on the sand bed. That was with 30 blue and 1 white

at 35 blue 5 white I was getting 250 6 inches down and 150 on the sand bed

since yours are higher up and you have a deeper tank I would turn them up a bit probably around 40-50 blue and 5 white

 

[maharba-wrx]

I just tested my 300w over my 40 breeder this weekend.
At 12” above the water I was getting 200 par about 6 inches down and 100-120 on the sand bed. That was with 30 blue and 1 white

at 35 blue 5 white I was getting 250 6 inches down and 150 on the sand bed

since yours are higher up and you have a deeper tank I would turn them up a bit probably around 40-50 blue and 5 white

Thank y

I just tested my 300w over my 40 breeder this weekend.
At 12” above the water I was getting 200 par about 6 inches down and 100-120 on the sand bed. That was with 30 blue and 1 white

at 35 blue 5 white I was getting 250 6 inches down and 150 on the sand bed

since yours are higher up and you have a deeper tank I would turn them up a bit probably around 40-50 blue and 5 white

Thank you for the info. That gives me a good idea and a starting point

 

[poloqr]

Hi! I have 2 of this lights and I’m running them on 25% blue and 20% white is it too much for corals? Im buying my first ones tomorrow! Thank you

 

[stovenut]

I run my 2 viparspectra 300s at 100 blue and 30 white. Plenty of PAR and good spectrum for sps.

 

[TCoach]

BRS did some testing, and your glass lid is costing you somewhere between 25-50% of your par if I remember correctly.

You might want to think about going with a net top if you want more par but not increased light output.

 

[oreo54]

BRS did some testing, and your glass lid is costing you somewhere between 25-50% of your par if I remember correctly.

You might want to think about going with a net top if you want more par but not increased light output.

Most report much lower losses.
20% max maybe. Somewhat depends on wavelength.

https://www.nano-reef.com/forums/topics/328196-do-aquarium-glass-or-acrylic-tops-effect-par-readings-in-the-tank/