I'm gonna grab a par meter too ...so we can get some real time reading on the CarombolaI'm a little skeptical about that light. First sign is the PPFD chart comparing 20 inches height to 39 inch HPS. You can spot the major spread difference, the HPS has less than a 300umol difference from the corner to center while the carambola has over a 600umol difference. Second is picking the worst 1000w HPS bulb to compare to, a 600w hps would be a more accurate comparison, coming in at ~1000ppf. Third is advertising it as a 5x5 light and showing a 3x3 ppfd chart. This much misleading info makes me wonder if the ppf data comes from a cherry picked light with top bin diodes, the average light may perform worse.
It's probably close to a 600w hps equivalent. I wouldn't try to flower more than a 4x4 space with it. And based on their spread chart, you probably want to hang it closer to 3 feet above the canopy to cover that kind of area. Depending on the price it could be a good deal. 9 or so of those lights is probably more appropriate for a 10x12.
Well all get to see if it's worth it together.