Low-pressure technology

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Convection flow in a high-pressure lamp, made visible by schlieren formation.

 
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Diffusion in a low-pressure lamp: no eddies visible, less heat is removed.

 

In the bulb of a conventional halogen lamp the operating pressure may be as high as 25 bar. The operating pressure of a low-pressure halogen lamp on the other hand is no more than 2.5 bar. For this reason the low-pressure lamps are approved for use in unshielded luminaires in accordance with IEC 60598-1. Because of the different pressures there are different gas flow conditions in the bulbs of the halogen lamps. Whereas there are strong convection currents in a high-pressure lamp, heat and gases in the low-pressure lamp are moved by uniform and calm diffusion.

Benefits of low-pressure technology

  • The luminous flux is more constant throughout the life of the lamp
  • The premature failure rate is greatly reduced
  • Power losses through the filler gas are reduced
  • Approved for use in open luminaires to IEC 60598-1
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Because of its design, the lamp can be operated in open luminaires.

 

Products with low-pressure technology

Are you interested in halogen lamps with low-pressure technology? Then look out for the “open luminaires” pictogram in the product overview.