The 6285 Mercury Arc Lamp contains an exactly measured amount of mercury and either argon gas or xenon which acts as a starter gas as the mercury vaporizes. This 500 watt Hg lamp has a 1.1 x 4.1 mm effective arc size. When the lamp is cold, the gas pressure inside is lower than atmospheric and you can see small globules of mercury inside the lamp. When the lamp runs, this mercury vaporizes and reaches pressures of up to 75 bar. So, these lamps pass from being a rare gas lamp to a mercury lamp. During the five to ten minute transition phase, the lamps run at a higher than normal current and the anode must be at the bottom to ensure proper vaporization of the mercury. Some mercury lamps have a reflective coating on part of the bulb. This speeds the transition phase and improves the thermal distribution. Because the bulb temperature influences the mercury pressure significantly, these lamps are sensitive to airflow over the bulb. Strong mercury lines through the visible and ultraviolet dominate the output spectrum of these lamps. A continuum in the infrared persists to 2.5 &mu,m and beyond.
Технические характеристики
- Type Mercury Arc Lamp
- Lamp Type Hg
- Lamp Wattage 500 W
- Average life 800 h
- Bulb Diameter 24 mm
- Effective Arc Size 1.1 x 4.1 mm
- Horizontal Intensity 2850 cd
- Approximate Brightness 300 cd mm-2
- Approximate Flux 30000 lm
- Lamp Current 6.6 A
- Lamp Voltage 76 V
