WRTL 2500
Lantern acquired in September 2008.
This lantern came from Claire, and is likely to have been used somewhere in Staffordshire as part of their PFI replacement works. The reason behind the lantern's removal is unknown - it is internally dated to 2004, and so was only about four years old when it entered the collection. The 2500 is not used in the Derbyshire area, although its aluminium-canopied sister, the Libra, was used for a short period.
The lantern bears a slight resemblance to the GEC Z9554M (later the WRTL MRL 135), although the bowl clips are identical to those used on the WRTL 2600. Notice that the reflector is positioned in order that the majority of the light output is concentrated directly downwards. The reflector is considerably shorter than the bowl is, owing to the same lantern being used for longer lamps.
The two bowl clips can again be seen here, along with two of the three bowl hinges on the opposite side of the canopy.
The bowl is completely clear (except for a series of warnings informing people carrying out maintenance on the lantern not to use abrasive cleaners on the plastic) so the only optical control on this lantern is provided by the reflector.
With the bowl opened, the available space at either end of the lantern can clearly be seen.
The reflector/gear tray is removed by loosening two screws, disconnecting the NEMA socket and unclipping the support hinge.
A Philips electronic ballast is positioned centre-stage on the back of the gear tray.
The lantern was attached to a wall bracket on Sunday, 27th May 2018. Owing to the single, rather short grub screw employed to fasten the lantern to a bracket spigot, a 42 mm diameter outreach was used; a 34 mm diameter bracket being too narrow.
In operation, the 'double reflector' arrangement worked well in enhancing the light distribution.
Lamp switch-on video:
Testing 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 to rated wattage | Percentage Difference |
| 244.3 | 0.12 | 29 | 29 | 49.9 | 0.98 | 28.73 | -7.27 | -20.20% |
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