Thorn 'SONPak 7' OT 70.T

New and unused, this example of the SONPak fitting dates from 1985, and the evolution from my 1982 example (the original version) towards my 1987 example is apparent.

By the time that this floodlight was made, the aluminium casing of the floodlight had been replaced with GRP (indeed, the 1983 version of this floodlight also features a non-metallic casing). The single bar that the visor hinges on to, along with the information plate that is pop-riveted to the reflector, remain the same as they did on the 1982 version, however.

The GRP used in this floodlight's construction is of a more matte finish than the 1990 version's bodywork is.

The lamp is date-coded "18", which signifies a manufacture date of June 1983. The 'EMI' suffix must have been a fairly new addition at this time, as the April 1982 lamp in the earlier version is simply identified as 'Thorn'.

The capacitor is dated to April 1985, and the stamped inspection date on the inside of the floodlight also carries this year, along with "37" - this is week 37 (the 9th - 15th September) of the year.

The floodlight was powered up on the same day that I acquired it - Saturday, 20th November 2010. Notice that the lampholder is inversed in this view; this is because the floodlight is installed upside-down - more out of necessity than variety!

Lamp warm-up video:

Testing the lantern with my energy monitoring device revealed the following results:

Test Voltage (V)	Current being drawn at full power (A)	Measured wattage (W)	Apparent Power (VA)	Frequency (Hz)	Power Factor	True Power (W)	Difference (W)	Percentage Difference
235	0.48	76	113	49.9	0.68	76.70	6.70	10

70 Watt SONPak Floodlights in the Collection
1982	1983	1985	1987	1990	1993	2000

Installation and Servicing Instructions

Thorn 'SONPak 7' OT 70.T (1982) | Thorn 'SONPak 7' OT 70.T (1983)