Let's go back to the 30watt per foot square standard for determining lighting needs. In the example that
@Lockebox is using with his 2 x 4 we have 8 ft square. Multiplied by 30 will give you 240w for your light needs. In the situation with the
HLG 260 v2 rspec, it has just a bit more power than needed to adequately light the 2 x 4 space. The OP has done pretty well matching the grow light to lighting needs. Likewise 2
SF2000 would light a 4 x 4 space. It would probably do well but the extra 60 watts offered per light by the
HLG 260rspec could lead to increased yield. A grower would probably want 2 of the
HLG lights to fill a 4 x 4 space though.
In a 4 x 4 you're looking at 480w of total light needs to hit the 30w per ft sq target. Some of these manufacturers are stating their lights cover more than they really do. Don't fall for this.
The 30w per ft sq rule makes it much easier to know exactly how much light you need for your space.