@99PerCent, cool set-up. How's the heat? @SkyDog The nice thing about the RAY series, that 99PerCent has illustrated, is that you could start off with a "more" reasonable expenditure (for a commercial grade fixture) and then eventually expand with more bars if you feel like you need it later (without having a mish-mash of various vendors and technologies). And they have three different lengths and a bunch of different spectra to choose from.
Still, the expense would be greater than, say, the ebay specials but I'd think it would be worth the investment if one has long term/on-going plans (for spectra / reliability / relative PPFD). In general, there are good reviews on the interwebs for the Fluence stuff.
If the budget is very tight / small grow, the are various vendors that have E27 base (standard incadescents) tuned for PAR. For instance, phillips has some horticultural LEDs for flowering that might be interesting, https://hortamericas.com/catalog/horticultural-lighting/philips-greenpower-led-flowering-lamps-3/ I would think that there are other options out there, too. And, there is are a ton of reviews / set-ups in threads on OG and elsewhere for different lighting strategies.