You're either completely blind or you're not even reading the posts on this thread before replying...No one, not even once, said 1x 1000w HPS could hang with 2x HLG-550s. Your statements are based on nothing. You just randomly come up with stuff like, "..so 500-550w quantum should get you pretty close". I've posted the data. Observe it, note the differences. You've got graphs for 1000w HPS in a 4x4 reflective area and the HLG-550 in a 4x4 reflective area, in this very thread. There is no debate. The HLG-550 has 30% less output over a 4x4 space than 1000w HPS, and nearly the same light uniformity. I've done the tests, you have not.
I've already stated I'm a proponent for LED. Are you reading my posts? I don't believe in HLG's claims that they've succeeded 1000w HPS with 50% less power draw. That's all.
I've literally proved it in this thread. The HLG-550 is inferior to 1000w HPS in terms of light output. That is a 100% fact, which you can verify yourself by purchasing a quantum sensor, 1000w setup, and conducting your own photometric uniformity test. Until you've done that, stop posting on this topic. No one needs the opinion of someone who just pulls random data/information out of their ass.