It’s used in Winter worldwide. Nobody’s ignorant here.
Why run just led and heaters, when one can run just HPS or HPS LED combo? No heater needed? One less thing on infared. That’s right, in many states its illegal to grow cannibis.
Led isn’t the only thing that has evolved, so has HPS and MH bulbs. Some really put out way better nowadays.
So around here, we see it as genius. Kills two birds with one stone, and one can add Led as well.