Tungsten Halogen - Double Jacket

Updated
14-IX-2014
Double Envelope halogen lamps consist of an inner halogen capsule sealed within a secondary outer bulb. The design may be adopted for a number of reasons - for instance to protect quartz capsules from accidental contamination with fingerprints, to protect surroundings from possible shattering of the inner capsule at end of life, to filter out UV radiation, to reduce the surface temperature of external parts of the lamp, or simply as a convenient mechanical structure which allows easy retrofitting of conventional incandescent lamps.

They were first introduced for special applications such as photographic and studio lighting, but were later engineered to replace ordinary incandescent lamps employed in general lighting service. In particular since the phasing out of low-efficacy incandescent lamps in many parts of the world, double envelope halogen lamps have grown in popularity owing to their low cost, perfect colour rendering properties, simple operation and similar appearance and dimensions to incandescent lamps.

Quartz Capsule High Power

Philips

1000W

Double Jacket High Efficacy - IODE
1989

Wotan

250W

Halostar High Wattage - Original Glass Design
1986

Osram

250W

Halostar High Wattage - Later Ceramic Design
1990

Quartz Capsule Low Power

Thorn

100W

Low Wattage Universal Burning - Ceramic type
1989

Thorn

100W

Low Wattage Universal Burning - Glass type
c.1989

Thorn

150W

Low Wattage Universal Burning - Frosted type
1989

Philips

75W

Halogèna Low Wattage Tubular Frosted
1989

Philips

75W

Halogèna Low Wattage Bulged Tubular Clear
1990

Philips

100W

Halogèna Low Wattage Bulged Tubular Opal
1991

Philips

60W

Halogèna Low Wattage Bulged Tubular Miniature
1991

Philips

60W

Halogèna Natural Light Plus Neodymium Glass
2004

Osram

60W

Decorative with unsealed Hexagonal Candle bulb
1994

Osram

60W

Halolux Classic Pear Shape GLS Retrofit
2004

Radium

60W

Halogen Double Envelope with Oxygen Fuse
2004
   

Hardglass Capsule

Sylvania

50W

Halogen DLX with Hardglass Capsule
1994

GE

51W

A-Line Performance Plus Hardglass Design
1987

Sylvania

72W

Capsylite High Efficacy with Diode Rectifier
1989

Integrated Transformer

Philips

30W

MasterClassic with 12V IRC Capsule & Transfo.
2008