Muggz, if you're running full enrichment, I'd use whatever combo gets you max lumens at the canopy...you can go up to 85*, maybe higher, so temp wise you have more wiggle room to play with. 4 BS is a lot of light, and a lot of heat. Max lighting recommendation for cannabis is 60w per square foot, so with 16sqft (4x4) you're looking at just under 1kw being the high end for lighting power. Either solution will yield great cannabis, but the more the merrier when growing inside. I have 1 BS 270w Chrome in my 2x2 tent right now and it's really outperforming my 240w BS flower model in terms of plant health and floor-plan because it has totally different lenses/layout so it's easier to spread things out and lift the light 6" higher. You might consider 2 or 3 of those to cover your size area...but again, to max out your plants you want to mimic 1000w of conventional lighting + CO2, so I'd say whatever your budget allows...