Philips 'Delta' 2620
Lantern acquired in March 2018.
Although branded as a Philips lantern, the Delta is another former Industria / WRTL / Indal product that was absorbed into the Philips product range following that company's takeover of Indal in 2011. The Delta is the successor to the GRP-canopied 2600 lantern, with a slightly revised external design featuring an aluminium canopy whilst retaining the tough polycarbonate refractor bowl of the earlier product. In Derbyshire, the Delta (then sold by WRTL, the UK distributor of Industria products) saw limited use as an alternative to Philips' own Streetfighter lantern on footpaths in the early 2010s. This particular example was an eBay purchase, but may have been intended for use in the Hereford area.
Whilst the 2600 features a rather angular canopy, the Delta's canopy is more curved. The lip supporting the bowl clips is virtually identical on both lanterns, though the 2600's clips and bowl have discoloured slightly through UV degradation.
Unlike the 2600, which requires an adaptor for mounting the lantern post-top, the Delta has a trapdoor-type adaptor that allows it to be mounted side-entry or post-top, with only the grub screws having to be removed and then replaced the opposite way around in the event that the lantern is to be installed in the alternative configuration. Here, the grub screws are facing the direction if the lantern were to be mounted post-top.
The difference in post-top mounting between both lanterns is evident here.
Both lanterns have the Industria Rotterdam logo moulded into their bowls. No attempt was made to alter this following the Philips takeover, suggesting that the Company was only planning to retain production of this lantern in the short-term, particularly at a time when street lighting lanterns equipped with a replaceable lamp were falling out of favour, owing to the sharp rise in LED technology.
Whilst the 2600 employs a traditional NEMA photocell for its operation, the Delta is supplied with a factory-fitted Royce Thompson Microstar 2000 miniature photocell. The rear panel of the Delta is removable, in order to simplify the action of passing a supply cable into the lantern.
The panel hides a 20 mm compression gland, which, when tightened around the supply cable, ensures that the lantern interior is sealed against ingress.
The 2600 incorporates a plug that fits into the unused side-entry spigot hole. With the revised means of attaching the Delta, the hinged trapdoor covers the hole when the lantern is mounted post-top.
The gear trays / reflectors are identical in both lanterns...well, I say that, but if you look carefully, there are a few additional holes present in the Delta's gear tray, owing to the variety of gear components that these lanterns could accommodate. Barely visible on both gear trays are the positions where lamp supports would be fitted for 18 Watt and 35 Watt SOX versions of the lanterns.
The gear trays hinge down on both lanterns, and the position of the supply cable connector block is the same. The gear components themselves differ considerably, however, with the 2600 employing a separate ballast, ignitor and capacitor, whilst a single electronic ballast in the Delta combines the purposes of the three components.
A Harvard 'Cool Power' unit drives the lamp.
Two labels are affixed to the side of the gear tray; one specifies the lampholder position depending on the mounting height, forward beam distance required and lamp wattage, while the other carries the technical information - the full part code for this lantern is 'DEL50HVMCMS2K', which I would translate as DELta lantern, with 50 Watt HarVard gear and a MicroStar 2000 MiniCell. The lantern was manufactured in February 2014.
The lantern was attached to a wall bracket on Sunday, 27th May 2018.
The electronic ballast ensures a smooth start for the lamp - no sputtering or flickering (as would be experienced with a lamp on conventional gear) occurs.
The front bowl refractors create a sort of 'portcullis' effect over the lamp.
Once the lamp is at full power, from the side, the output appears much brighter.
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 |
| 239.6 | 0.23 | 53 | 55 | 50 | 0.96 | 52.90 | 2.90 | 5.81% |
ELECO HW-747 | Philips MI 26 × 2
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