Here’s my take on the Orphek/Quanta comparison. The Orphek will give you more channels to dim per bar, which I don’t think is necessary for a bar, and the helix just gives you dimming of the whole bar. Orphek is just now catching up with the diode count on their bars to the early quanta pro bars (2 diodes per lens), but the helix has 4 diodes per lens and each lens has four different wavelength diodes, meaning, the blending happens as soon as the light leaves the lens. The helix meso blue only has two sets of colors running the length of the bar (blue and violet), which increases the blending of all the different spectrums throughout the bar. I believe the Orphek requires another unit or controller in order to dim them, but I could be wrong? Quanta helix is a simple 0-10v bare wire dimming, so your dimming options are many. Having owned Orphek (OR2’s) and directly comparing them combined with xho’s, the Quanta pro meso blue out performed both of them combined (par and spectrum). The helix improves on the design even more by increasing the diode count, blending and output, which is roughly 15% more than the pro version.
I was going to change my lighting to just meso blue and tropic suns (12k spectrum), but the announcement of the Atlas and Helix release changed my mind. I now use a single Atlas and two meso blue pro bars over my 36x36x16.
The meso blue is such a good bar, that you can combine it with any fixture and it blends in so well. My son’s tank has two meso blue pro bars with two Kessil 360x’s and it’s an amazing combo. I have another friend who uses quanta bars with two Kessil 500x’s and it’s an awesome combo.