I have the Sunpower 6 bulb 48" non-dimmable unit, and while I still haven't borrowed the par meter, but SPS I have that survive my water quality, look great.
Of course, the look of the corals greatly depend on the type of bulb you put in.
Pros Non- Dimmable:
-Costs 150$+ more just for the one function
-does everything else
-I honestly do not feel it is necessary since with the 6 bulb model, I can program 2 bulbs with the 'low light' but pretty characteristics for the 1st and last 2 hrs of the light cycle. I use the Purple bulb and Coral + mix because it's really pretty and makes the best 'pop'.
Then the Blue + come on afterwards and brighten everything up even more.
- need to adjust height for acclimation with the hanging kit instead of just using whatever dimming controls that comes with the light.
Do you need the VDM or something with
Apex to control the dimming functions on the Apex controller?
If it's necessary, then that's extra cost.
If it is necessary but you already have it...then great, but the principle is the same
Cons-
You can't dim...so I guess if you wanted to or NEEDED to acclimate your coral, you would need to raise it or lower it. However, this is extremely easy and was not worth the extra $150 for me.
Lol, heck, I could buy more apex/etc crap for my tank instead.
Speaking of...I should try and borrow that par meter before the week is out.