I would not use those lights unless I had no other option.
In a small grow space, I would go with the Vipar XS-1500 Pro.
(checks the OP's message again) - good you have a Vipar. Is it the XS 1500 or the XS-1500 Pro? I've got the 1500, which I bought a few years back, and the Pro is a far superior product. The cheap lights whose pictures you've posted generate very little usable light.
Simple point - at 12", the PPFD map (light intensity) shows that a tiny square in the middle is 512µmol (micro mol). That's not enough for flower. If you move a few inches away from center, the light levels collapse. Seedlings should be run at 300 and you should get your plants to 800-1000 in flower. Those lights might be good for some plants but can not produce adequate levels of light for cannabis.
How big is your grow space?
If you're in a 2' x 4', I'd add another XS-1500 Pro.