Genura Self-Ballasted Electrodeless Induction Lamp

Genura is the worlds first commercial light source to combine the electrodeless induction lamp and all associated electronic control gear into a single retrofit unit.  Several years earlier Matsushita and Philips were first to market the Induction lamp with the Everlight and QL product ranges, however those are high lumen package lamps which require an external ballast.

GE's Genura is a 23-watt source and is the fruit of many years research carried out by Thorn Lighting on electrodeless lamps.  Thorn had succeeded in building these light sources many years earlier, but it was not until the GE takeover that the research team could benefit from GE's expertise in electronics, and a combined unit could be produced.  Incidentally the product name Genura stems from "GE" and "Nura", the Indian word for light and one of the many brand names adopted by Thorn to market its lamps internationally.

The lamp operates at a frequency of 2.5MHz, similar to the Philips QL for optimal efficacy and at a wavelength which does not interfere with domestic equipment.  The discharge vessel has a re-entrant stem running up the centre, and a ferrite coil with a few turns of wire is located inside this stem but outside the lamp atmosphere.  The mercury amalgam dose resides inside a long exhaust tube running down the length of the stem.  An emitter coating is applied to the glass re-entrant while the bulb is internally coated with fluorescent phosphor and a special anti-blackening pre-coat.  By the induction principal, the electronic 'ballast' drives the ferrite-cored coil at high frequency and this leads to ionisation in the discharge vessel.  The inside of the bulb has a conductive fluorine-tin-oxide coating to screen undesirable radiation, and is capacitively coupled to an external silver coating on the rear.
Manufacturer: GE Lighting Europe
Lamp Power: 23 Watts
Lamp Current: 0.21 Amps
Lamp Voltage: 220-240 Volts
Operating Frequency: 2.5 Megahertz
Cap: E27s/27 (Nickel plated brass)
Bulb Finish: SnO2 semiconductor film Colour 830 phosphor
Bulb Type: R-82
Overall Length: 131 mm
Mass: 200 grams
Atmosphere: Ar | Hg-amalgam
Luminous Flux: 1,100 lm (at 100 hrs) 920 lm (at 2,000 hrs)
Luminous Efficacy: 47.8 lm/W (at 100 hrs) 40.0 lm/W (at 2,000 hrs)
Colour Temperature & CRI: CCT: 3000K CRI: Ra 82
Chromaticity Co-ordinates: CCx: 0.440 CCy: 0.405
Burning Position: Universal
Rated Life: 10,000 hours (to 50% survival)
Warm Up / Re-strike Time: 15 secs (to 80% lumens) Instantaneous
Factory: Budapest, Hungary
Date of Manufacture: January 1994
Original / Present Value: 30.05 (1994) 36.12 (2001)
 
References: 1) GE Lighting UK Technical Data Sheet, 1994.