Car brake lights doesn’t look like the image on the right in real life though. Glowing Objects IRL loses saturation as you increase the brightness
As you can see from the above image, only bright and slightly de-saturated parts of the break lights produce bloom.
Back to the question of maintaining Red Color, like @ClockworkOcean suggested, I would also recommend using a single particle with an additive material to achieve the bloom effect while keeping the brightness of the emissive material low