Hello, I'm new here.. I have a question about running a lot of LEDs in a couple scenarios. I'm building a full-size lightbar for a fake police car to be used in movies. I found a schematic for the red & blue LEDs that I'm going to duplicate using some 555s or 556 here: http://www.instructables.com/id/41-LED-Flasher-Circuit-using-555-IC/ But I would also like to (easily & cheaply on a no-production-value film budget) get yellow LEDs on the back that would show direction by illuminating at one end and moving across. I've made this before using a 555 and a 4017, but only one LED at a time. I want to make it realistic so I'm dropping about $80 in LEDs so each segment would be 6-10 (30mA) LEDs instead of just one little one. What would be the best, cheapest and most reliable way to do this? Can I use a transistor for the added current or a relay of some sort? I've been searching on and off for months for this solution, but I don't think I know the proper nomenclature to find what I am looking for. Thanks!