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Between 150 and 500.
I know this ain't helping you much but you need to find the perfect spot for your SPS by starting low and build and sometimes move it around for more flow or a bit less.
What light do you run as PAR values between, T5/MH and LED's are a bit different if using a par meter.

I believe it's a very good light .. it's from philips I'm sure one of their top guys is on here on R2R ..

Totally agree with you .. !!Oh I believe you, Philips is a old timer.
My great grand parents used to work for them in Eindhoven the Netherlands when they were making the first light bulbs and after that transit radio's.
Philips also makes TV's or flatscreens how you call them now, washer/dryers, coffee makers, and lots more.
Now they making aquarium LED's light as well
Yet it's a fairly new light in the industry and they copy a lot from others being in the LED industry just to have a stake in the market.
Believe me the top guys who will rate this light are the consumers on here that get first hand experience with it.
It's not till a few years that you can say it's working for you.
Many ppl switch after two or three years or upgrade to the next generation which is always better of course according to that same top guy in that company.
I have done it all, T12, VHO, MH, T5, LED's from different companies and it all works great but the secret is in most if not all how you keep your parameters stable, that is the key here on being successful or just a hobbyist.

