I run 2 X 165W and 4 X 300W ViparSpectra (LED lenses removed, added acrylic diffuser sheet on each) over my 300 gallon along with 6 X Kessil A360WE. The Vipars provide a great "blanket" of uniform light in this configuration across the entire footprint of the reef - currently around 250-300 PAR at the rubble line (CH01-blue @ 70%, Ch02-white @ 50%), around 350-400 PAR at the reef crest.
The Kessils are used to boost PAR midday to around 300-350 PAR at the rubble line, 400-450 PAR at the reef crest for about six hours - and provide a great shimmer/glint line.
Growth is great in my book, and the "feel" is like shallow, clear-water snorkeling.
The configuration:
26 April 2020 Acropora yongei (my favorite in a slimy kind of way...Bali Green Slimer)
07 April 2021 for growth rate comparison...
A little taste of why I spend so much of my time with my nose pressed against the glass...from a few weeks ago...
The ViparSpectra put out a pretty darn good spectrum for coral growth and appearance, just be careful to set them up with a PAR meter - or you may end up bleaching out your coral (been there and done that...do not want to repeat).
Cheers,
Ray