I was just asking a light company about this today actually. I wanted to switch our my halogen front blinker bulbs for LEDs one, but not at the expense of filling my entire engine compartment with wire harnesses. I really like the performance and look of LEDs, but I have to draw the line somewhere. I was floored by the amount of resistors, wire harnesses, and relays etc on the HID headlight kit and fog lamp replacement. I wish I could just replace my interior cab light with an LED bulb and not have my TH go bonkers on me.