Lantern acquired in July 2010.

Thanks to Pete Greenall for donating this lantern to the collection. Being designed for fluorescent lamps, the HW-727 is a rare lantern throughout the UK; this particular example was removed from private land in Glasgow by contractors. I know of one example in Derbyshire, and again, this is privately owned but has not undergone any maintenance for many years.

The HW-727 is recognisable by its sleek appearance and shallow bowl. When the lantern was removed, a short length of the bracket remained fitted - this was duly removed from the lantern's spigot.

From above, the lantern resembles an elongated HW-918.

The bowl has become slightly cloudy through age, although the lamps are still visible inside. The bowl has no refractors in which to diffuse the output from the lamps moulded into the plastic.

The lampholders are spring-loaded. This allows the lamps to be held in place during operation, and then easily removed for maintenance. The two rear lampholders (seen on the left here) are discoloured from being partially submerged in rusty water, owing to water gathering in the bowl as a result of the tilt on the lantern when installed.

The hinged sheet aluminium gear tray doubles up as a reflector. Despite this lantern's age, all of the fixings are free from corrosion, and all appear to be turning without a problem.

Unfastening the gear tray reveals the enormous ELECO SMQFH/2240/TF high power factor ballast. This unit combines the functions of a ballast, starters and a capacitor. The bracket would be secured using the clamp on the left. Loosening this did not, however, immediately free the pipe, owing to a build-up of corrosion around the spigot. A few gentle taps from a hammer soon 'persuaded' the remains of the bracket to part from the lantern!

The operating voltage of the ballast is stamped on after manufacture - '240' can still just about be seen here.

A wiring diagram is also provided on the ballast - this may prove useful in the future!

Philips 'Mini Iridium' BGS 451 | Thorn Alpha 1




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