Halogen Infrared Ruby Slim Vertical
When the original infrared quartz lamps were first trialled in spaceheating applications, one of their principal drawbacks was the unacceptable level of visual glare that accompanied these high power sources. This surprisingly simple situation took several decades to solve, because the lamps ran far too hot to be able to use the traditional filter coating materials.

Westinghouse was first to attack this by flamespraying its lamps with orange iron (III) oxide pigment, but this still transmitted a lot of light and absorbed too much infrared. It was not until the early 1980s development of the Ruby Jacket lamp by Thorn that the first commercially viable solution was achieved. However those lamps were expensive to produce, and efforts continued on colouring the inner halogen tube directly. Further improvements were achieved by Thorn with a primitive Ruby Slim lamp, but that was extremely difficult to produce, and by Philips with the Gold Dichroic lamp of 1999, but that was also a costly design.

The challenge of making a lamp in ruby quartz was finally achieved by UK manufacturer Victory Lighting in 1999. Recognising that coloured quartz could not be pinch-sealed due to its high thermal conductivity, Victory perfected an ingenious approach conceived but never mastered by Philips some years earlier - to develop the colour after pinching. The quartz is first doped with copper oxide particles, and this feint pinkish material can be pinch-sealed by standard methods. The sealed lamps are then placed in a hydrogen furnace to reduce the oxide to copper metal particles, and this develops the desired ruby colouration. This particular lamp is able to be operated in any position, thanks to the dimpled quartz bulb around the filament supports.
Manufacturer: Victory Lighting
Lamp Power: 1000 Watts
Lamp Voltage: 240 Volts
Lamp Current: 4.17 Amperes
Cap Type: SK15 + U-Terminals Silicone Cables
Bulb Type: T-10.5 T-3 in eighths/inch
Bulb Finish: Ruby Quartz
Filament Type: C-8 Single Coil Axial
Lighted Length: 260mm 101/4 Inches
Atmosphere: Argon Bromomethane
Luminous Flux: 200 lumens
Luminous Efficacy: 0.2 lm/W
Luminous Intensity: N/A
Beam Distribution: N/A
Colour Temperature & CRI: CCT: 2500K (Filament) Ra: 40
Chromaticity Co-ordinates: CCx: 0.645 CCy: 0.280
Lifetime: 5000 hours
Burning Position: Universal
Overall Length: 346mm 135/8 Inches
Factory: Wembley England
Date of Manufacture: 1999 Date Code: G50 G389
Original Value:
References: 1) Photoelectric measurement.
2) EU Patent 0,560,420 - Infrared Halogen Lamp with Ruby Quartz Bulb - J.A.C. Mewissen (Philips) - Filed 1992.