Patt.45 (1928 approx - 1978)
Strand

Patt.45 Mark 3

250W Miniature Spot (later 500W)

Mark 1 (Pre 1930)
100 or 250W (E27 / B1/2) Miniature Spot. 11-39 degrees. 4.5 x 6.5 inch plano convex lens, spherical reflector, slide focus, rear access. Introduced pre 1930, uprated to 500W in 1952 with P28 lampholder.

Mark 2 (1952)
250/500W (P28, T1) Miniature Spot. 4.5 x 6.5 inch plano convex lens, rear access. From 1952. Replaced in 1960 by Mark 3.

Mark 3 (1960)
250/500W (P28, T1) Junior Spot. 16-45 degrees. 4.5 inch diameter fresnel lens, no reflector. Rear access. Introduced 1960, replaced 1978 by Pattern 833.

From Lighting & Sound International, November 1985
Conversion Kit for the Patt.45
Phillip L. Edwards Theatre Lighting of Glossop, Derbyshire have announced the production of a conversion kit to enable the ever-popular Patt.45 "optical biscuit tin" - the mainstay of many school and small theatre stages - to be brought up to date and allow it to compete with modern lanterns "on equal terms".
At the other end of the scale the company, a family run concern, has added a Rank Strand M24 control system to its hire stocks, and is offering it with or without dimmers and mains distribution "at economical hire rates". The company carries out a variety of commissions ranging from the supply of complete lighting installation for the Buxton Festival (annual) to providing the touring lighting system including control and lanterns with rigging for the Nottingham Playhouse Roundabout company.