Red whirlpool lights just follow the lighting schemes in Williams games.
I.e. Yellow to light an award, green for locks, red for jackpots.
Each whirlpool lamp lights for each ball ball shot to it during “ride the whirlpool.” Once they all flash, it scores a jackpot. They’re also the same color as the Boulder awards (and shooting the whirlpool awards a Boulder), so, if I were a betting man, I’d say that’s why they chose red bulb condoms in the whirlpool.
I really don’t think people notice the nuance in the whirpool Lights to count the balls until a jackpot is made, so blue does make sense too.