Date code 08 = August 1982 (Leicester, UK)
Date code 15 = March 1983 (Leicester, UK)
This elliptical lamp features an unusual pearl coating to the outer bulb - it is believed that the machinery used by Atlas in the 1960s to make their 80 Watt pearl mercury lamps was re-used in order to produce these SON lamps.
Date code 20 = August 1983 (Leicester, UK); came with the Thorn Precinct bulkhead.
Slightly later lamp; date code 57 = September 1986 (Leicester, UK)
SON-E Deluxe (Leicester, UK). Date code 11 = November 1982 - this lamp came with the Thorn Alpha 8 lantern.
SON-E (Leicester, UK). Date code 76 = April 1980 or 1988. This, and an identical lamp are used in the Gamma 4 post-top lantern.
SONXL-T "Extra Light Output" (Leicester, UK). Date code 08 = August 1990.
SON-E Deluxe (Leicester, UK). Date code 96 = December 1989.
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