This is a General Brand FRK Lamp -- a 2-pin (one pin thicker than the other) ceramic base bulb for light fixtures and projectors, also known as a CP-89.

Note: Bulb brand may vary depending on availability. 
Phillips Brand not compatible with Strand Bambino 650W Fresnel.

Compatible substitutes:

GEFRK  (G.E.)

USFRK  (Ushio)

For 220-230 Volt use, order: FRL

For  240 Volt use, order:  FRM