Clear vision at half the distance, shadowy vision at the full distance

Light bearers get +1D to hit & enemy gets +1D to hit them (no hiding possible)

Infravision takes a turn (or 1d10 rounds) to activate in darkness.

Torches, candles, lanterns last for a duration in REAL time.

Use actual dimmers in the game room to show how bright a room is.

Place an LED tiki-candle next to players whose PC holds a light.

Another rule...see my note below...