Wotan Circolux Electronica 18W

One of the earliest compact fluorescent lamps to feature electronic control gear was this creation of Osram's Italian plant at Bari. It was offered in three ratings of 18, 24 and 32W, intended to replace 75, 100 and 150W incandescent. The lamp is based on the form of an ordinary circline fluorescent tube, but of reduced dimensions, and equipped with integral ballast and a bayonet or screwbase cap, to directly replace incandescent lamps. The Lumilux Interna phosphor creates warm incandescent-like light of good CRI.

The shape of the lamp serves a special purpose, in that most of its light is radiated in the vertical plane. It is thus especially well suited to pendant luminaires, which are large enough to accept the dimensions of this lamp. The lamp found numerous applications also in the illumination of tables in restaurants, small office and conference tables etc. The lightweight electronic gear furthermore made this lamp a preferred choice in rise-and-fall pendant luminaires which were popular in domestic lighting during the 1980s.

One of its undoubtable features however, was its eye-catching circular appearance. Whereas other compact fluorescent lamps attempted to mimic the small light source of incandescent lamps, this version capitalised on its unique appearance and many architectural lighting installations called for the installation of this lamp as a part of the design. However as with all products offering a unique appearance, the market quickly tires of the new trend and this was ultimately the reason for the downfall of the circular fluorescent lamp. After a decade or two of success, lighting designers wishing to express their individuality on a new installation soon turned their sights on alternative lamps.
Manufacturer: Osram GmbH
Lamp Power: 18 Watts
Lamp Current: 0.073 Amps
Lamp Voltage: 240 - 250 Volts
Cap Type: B22d/25x26 Brass + vitrite insulator
Bulb Finish: Triphosphor 827 Lumilux 41
Bulb Type: TC-28.5 TC-9 in eighths/inch
Maximum Diameter: 165 mm
Overall Length: 100 mm
Mass: 210 grams
Electrodes: Triple coiled tungsten Triple carbonate emitter
Atmosphere: Ar | Hg
Luminous Flux: 1000 lm @ 100 hours
Luminous Efficacy: 55.6 lm/W @ 100 hours
Colour Temperature & CRI: CCT:2700K CRI:Ra 80
Chromaticity Co-ordinates: CCx: CCy:
Burning Position: Universal
Rated Lifetime: 8000 hours Rated to 50% survival
Warm-up / Re-strike Time: 3 minutes Instant re-strike
Factory: Augsberg Germany
Date of Manufacture: 1988
Original / Present Value: £14.88 (1990) £22.03 (2004)
References: 1) Osram UK Brochure "Electronic Energy Saving Lamps", July 1992.
2) Osram UK Price List, October 1990.