If you pick up an IR thermometer off Amazon or somewhere they are super cheap like $15 and with that you can tell your leaf temps, ideally 75F. That way you can tell if your lights are to close or your ambient temps are to high and vice versa. Very good tool to have on hand and is dirt cheap.
I also use "light meter" app you can download on your phone for free. Nowhere near as good as a par meter but 100% better than flying blind. I go seedling 5000-10000 lux, veg starting at 10000 lux and increasing up to about 40000 through late veg. In flower I hit 75000-80000 lux but I run CO2. 40000+ is good for flower.
With the IR and that app you can get max benefits of your lights without heat stressing the plant. $15 total for a lot of peace of mind.