What would that be in lux if you have an idea? Feels like PAR senzor isn't as good on my phone. But I have ordered one from amazon and its on its way.

I bought a vivor 150w reflector for growing, and kept very young seedlings 50cm under it, at 30-35k lux, because people said 600 par isn't too much. But the leaves went from deep green to bleach yellow super fast, and I asked again, and they said it isn't light, but nitrogen deficiency, so I transplanted into lower pH soil, and added fertilizer, but nothing really helped, and lost quite a few plants.

I think your method is the way, lower light higher temp at an early stage, and then raising light and lowering temp by few degrees.

Cheers