such as a g4 g5 or g6 pin cap is also conceivable a ba9 or ba15 bayonet cap is also conceivable if the retrofit led lamp 1 is supplied with mains ac voltage or with low volt voltage by means of an appropriate lamp holder current matching is needed in order to correctly operate the led module 7 the bulb has a driver circuit 5 for this purpose the latter may have any control circuit conceivable for this use as known from the prior art an ac dc converter for rectifying a mains ac voltage can be considered for example a dc dc converter or another converter which reduces the voltage or the current or the power may be advantageously connected downstream of said ac dc converter in this case it is possible to use a switch which is switched using pulse width modulation pwm a downstream current limiting circuit for example using a transistor circuit can also be considered the led module 7 may have one or more leds and or oleds in this case it is possible to use in particular phosphor converted blue leds rgb led modules or the conceivable combinations thereof the phosphor converted leds are in particular at least one blue led in which some of the emitted blue light is converted into yellow or greenish yellow light by colour conversion media such as phosphor the use of phosphor converted green and or greenish white leds is also conceivable one or more red leds or other monochromatic.