This depends highly on your lights specs, some can be as close at 20cm/8" and other need to be far away aorund 75cm/30" or higher.
Given you light is a Mars Hydro ts1000 these are the recommended hang heights
Seeding: 12" @ 50%
Veg: 12" @ 75%
Bloom: 12" @ 100%
Use the dimmer to your advantage :D
https://www.mars-hydro.com/ts-led-grow-lights/ts-1000-led-grow-light
Hit view more at end of page and scroll to find the suggested hag height infographic.
Play aorund with them and do what works best for your plants. Some strains like a more intense light vs others.
Best Of Luck!
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