Virtually no information can be found online about the old Candela Portsmouth, so what you see is what you get in the case of these lanterns. I've witnessed them running ceramic-metal-halide and high-pressure sodium lamps up to 150W. A few visual queues that you have an old Candela Portsmouth are: The canopy overlaps the decorative aluminium ring slightly, the canopy has visible rings that make up the semi-sphere, The side-entry spigot is a single cylinder (rather than the newer triangular design) and the optic is different. They share optics with Philips lanterns which is what made these so difficult to identify. I've also seen them mounted top-entry.

Birmingham

A mix of old Portsmouths and new Portsmouths exist around Birmingham City Centre. Pictured below is the lantern on column 3 of Dudley Street:

Followed by column 1:

The columns continue down Dudley Street, most of these columns inhabited by the old version of the Candela Portsmouth.

Column 2:

Column 4:

The adjacent Edgbaston Street also is littered with these lanterns.

The higher ones run 150W SON-T lamps, where as the ones at 6m run (I believe 45W) CPO-TW.

The CPO-TW lamps have baked a small area of the bowls on these lanterns.

Below is column 1 of Edgbaston Street:

The CPO-TW gear trays are probably not original to these lanterns, instead a company called UK Centol made them to fit in place of what were probably SON gear trays.

Column 1A:

The installations continue down Park Street...

Standing on the footbridge visible in the above image provides a unique perspective of these lanterns. Notice the far one has been damaged!

Another column down the road:

This day-burning example was spotted nearby, running it's 45W CPO-TW lamp. It is the 6m lantern on column 8 of Moat Lane.

The lantern on column 9 of Upper Dean Street lacks it's bowl, allowing the optic to be seen in closer-detail.

A CityWhite lamp of 150W can be seen in this one, along with the same reflector as some Philips lanterns.