The 1156 is the sole bulb type listed across all turn signal positions on the Hino FD2218LP for the 1993-1995 model years.
The 1156 is a single-filament bulb, meaning it serves one lighting function per socket rather than combining two functions such as braking and signaling into a shared unit.
It operates on a 12-volt electrical system and draws 21 watts, which places it in the standard incandescent range for automotive turn signal applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d base used on two-filament bulbs.
The 1156 conforms to ANSI standards applicable in the United States and Canada, indicating the specification follows North American automotive lighting norms.
The Hino FD2218LP uses the same 1156 bulb size for both the front and rear turn signal positions across all listed model years, meaning the same bulb type fits all four turn signal sockets on the vehicle.
Because the BA15s base accepts only single-contact bulbs, a dual-filament bulb such as the 1157, which shares a similar bayonet-style base but carries two pins, is not a compatible substitute despite the physical resemblance.