Some of your wording is making me feel like there’s still a disconnect.
Whether or not you have pure white or pure black is irrelevant.
Let’s start with context of what the 65% max power represents. 65% power is 65% power irrespective of burning an image, fill, line, grayscale, etc. It’s literally 65% of max power for the laser module. What that max power translates to in terms of actual output power is unknown to LightBurn.
The entire grayscale range is fit within the upper and lower bounds of power settings. Check out this diagram for examples of how grayscale ranges would map to power % level.
