LED BAR light Sponsors?

4 sq feet only needs 130w of a high efficacy light or maybe 160w for a middling efficacy light with 12 hours of operation time. Efficacy of light will determine the number of watts you need. This suggestion would be roughly 35-40DLI in a 4x4. Viparspectra has a decent 150w light, but not high efficacy, so a few more watts wouldn't hurt but also probably not a noticeable of a difference with your eye (yield) if you did have a few more watts. Most lights in this range won't be high efficiency, so expect maybe 5 good years of constant use out of them at the most. Lower efficiency = shorter lifespan, more heat, more watts spent per umol/s producted etc. It's hard to justify the added cost of a high-efficacy light at this scale, though. If only saving 1-2 USD a month of electricity who gives a fuck? right? Thios isn't doom and gloom, just a matter of fact. Less efficient lights grow the exact same quality of bud the genetics allow. No worries. It only impacts longevity, heat produced you may or may not need to mitigate and cost of operation.