Add years of service to your:
Strand Pattern 23
Strand Pattern 123
Early model Selecon SP500 Profiles and SF500 MkI and MkII Fresnels
In fact any Strand Electric or Selecon manufactured stage luminaire, up to 650w, utilising the old Pre-focus P.28 (push and turn) lamp base can be given a new life.
Data Sheet (pdf)