Flipsieanswered grow question 8 months ago 25cm is still way too close. You can find the SPEC SHEET for the LED as a download on the product site, with detailed graphics for 1.5x1.5m. Use the same distances, but a bit higher They recommend 50cm to 1m. With such strong lights you maybe want to get a device to measure your light intensity or you can use your smartphone lightsensor with an app first. And aim for under 700ymol/s/m^2, higher intensity may need CO2.
I would start with 25% and increase to 75% during veg. Keep your distance larger in the first 2-3 weeks of flower, so they can stretch. A close light that strong can keep them down. During flower i would use 100% until the last 1-2 weeks. There i would use 75% for terpene preservation.