Indicator bulbs are the bulbs that signal your turns and change of lanes to the fellow drivers. In many countries, it is legally necessary to have indicators in working conditions. You can upgrade these bulbs to halogens or LEDs as per your liking. You can also choose from a single filament or double filament in the halogen category or among the various colors in the LED category to make your indicator lights shine bright and give better indicators. Be cautious as situations like hyper-flashing may confuse the drivers and may cause panic. Such instances also happen as people use LEDs instead of halogen lights. LEDs use comparatively less power than halogens and lead to brighter, flashier lights.