Dynamic lighting stacking

I'm running a group in the home using the maps on roll20. I recently upgraded to enjoy the dynamic lighting, and I am! We are running the players tokens on a map on 1 TV, with me on my laptop manipulation monster tokens. 3 people in my group have dark vision, so i'm giving them 60 ft light with dim at 0ft. which works perfectly. however when more than 1 of their light auras meet it increases the light level in the overlapped area, all the way up to . While this isn't a deal breaker, i'd like to find a work around or something for this for my setting. Does anyone know how?

On the edit token, advanced page (as a GM) there is a checkbox underneath the lighting that is "All Players See Light". If you unselect this, only that player will see that light (emulating darkvision). In your specific set up I'm not too sure how that would work with multiple players on the same screen. I'd maybe suggest having four tabs open, one for each player, and switching between them based on whose turn it is, but that might be unreasonable/unmanageable. An alternative to that is to make sure that they have 60ft with dim at 60ft (so no dim at all really), but I think that removes the "shadowy" feel of it. I've had the same problems with it visually in my games: because of it I've reduced the number of interacting light sources.

On the GM screen the "dim" lights are additive, so a bunch of dim lights will equal a bright light, this is also how congress works...