You'll need to name the lights that will grow brighter or dimmer. Name them all the same thing. For example, blu_lt1, or red_lt1. Then when a team takes the point, add outputs from the trigger_capture_area OnCapTeam1 that turn the lights on and/or SetPattern (patterns step up in brightness from a which is dark to z which is bright).
For example:
trigger_capture_area -> OnCapTeam1 -> blu1_lt* -> TurnOn
trigger_capture_area -> OnCapTeam1 -> blu1_lt* -> SetPattern -> bdjhmnoxrs-> 0 sec
trigger_capture_area -> OnCapTeam1 -> blu1_lt* -> SetPattern -> srsrsr -> 2 sec
trigger_capture_area -> OnCapTeam1 -> red1_lt* -> TurnOff
Should be simple, but you'll have to play with the actual patterns and timing to get the "flickering up with power" effect. Basically you'll want a flickering, brightening pattern, then replace that one with a steadier pattern after a second or two. [Edit] And optionally, you might want a flickering, dimming pattern for when the lights go out/dim.
One warning: naming a light makes it dynamic, which is a lot more resource intensive. So you should NOT do this to every single light but only a few in key areas to create the effect.
Kep