Well, you can "calculate" it, but truthfully, I eyeball it and just swap values until I like the effect. Generally, the resistor will be between 470 ohms and around 2K. If you only have two red marker lights on the sides, it ends up being closer to 2K. If you have three lights, sometimes it'll be 470, 680, 1K, etc. The value will also depend on how bright you run the interior lights.
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