Ah, something to understand is that the light radius and light dim radius both start from the token. Setting it to 40/40 will be 40ft of bright light, and no dim light because the dim is set to begin at 40 which is where the light ends and the penumbra begins. The light radius sets “how far out is there light” and the dim radius sets “where does the light transition from bright to dim. If you want any dimness besides the penumbra, your dim radius needs to be less than your light radius. 40/20 would be half bright and half dim. 40/0 is all dim (except that initial brightness in the origin square). 40/-40 tricks the initial square to begin significantly dimmer. It’s easiest to think of the light on a number line where anything less than zero isn’t visible. =D