From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The correct types of lamp bulbs for the New Phantom, 20 HP, and Silver Ghost models.
| Identifier | ExFiles\Box 71\2\ scan0009 | |
| Date | 9th December 1925 | |
| X8800 To BY/C. from EFC. EFC6/T9.12.25. RE: LAMP BULBS. X5800 X3576 The correct bulbs to be used in the 40/50 New PhantomCodename for PHANTOM I and 20 HP. head lamps are the Lucas bulbs marked :- B.A.S.4.S. 12-14V. 36 W. OSRAM (37) (Gasfilled), the affix S in the first line denoting single pole. The Silver Ghost will have the same, but leaving out the affix S, such bulbs being double pole. For the side and tail lamps we have generally used :- Sphinx (Auto Bulbs Ltd) side lamp bulbs, 12-14 Volt, 12 c.p. Bulbs dia. about 26 mm. The smaller bulbs are preferred as the larger ones will not go in the Lucas spare bulb cases. Sphinx (Auto Bulbs Ltd.) tail lamp bulbs, 12-14 volt, 3 c.p. No.834P. though no doubt suitable Lucas bulbs are obtainable. EFC. | ||