Instrument / pilot (parking) bulb replacement 6v / 12v bayonet LED, negative earth), Ba9s base (single filament) T11 bayonet 5 LED, white.. Replace original instrument bulb or pilot (parking) lightand save at least 1/2 amp compared to a normal 3cp (3w) bulb. Warm white 6000K approx 100LM, 0.9W. . Bulb has Ba9s mcc base (aka Type 51).max width 12mm, max height 30mm, base 9mm