Universal D2 lamp bulb and connection component thereof

The utility model discloses a universal D2 lamp bulb and a connection component thereof. The D2 lamp bulb comprises a lamp tube, a lead and a lamp head, wherein the upper end of the lamp tube is connected to the lead; the lower end of the lead is inserted into the lamp head and is connected to a first connection wire; the lower end of the lamp tube is inserted into the lamp head and is connected to a second connection wire. According to the universal D2 lamp bulb, a D2 adapter is simplified; the lamp tube can be replaced for achieving the purpose of replacing the lamp bulb; the universal D2 lamp bulb is simple to mount and convenient to maintain. Through the D2 lamp bulb and the connection component thereof, connection manners for connecting D2 adaption wire with the connection wires between the lamp bulb and a ballast are reduced, so the wiring manners are optimized; the problem that the lamp bulb is turned off because the circuit is suddenly cut off due to misconnection or poor contact can be avoided, and the driving safety can be improved.