Grounding: The lamps must have good wiring and grounding according to the requirements of the manual. If the Class I lamps are not grounded, they will become similar to Class 0 lamps;

Allowable voltage fluctuations: HCI ceramic metal halide lamps, HQI quartz metal halide lamps and NAV high-pressure sodium lamps require that the voltage fluctuations within a short period of time should not exceed +/-5%, and the long-term allowable fluctuation range is +/-3%, which is more Large voltage changes will shorten the life of the lamp and cause color shift;
　
The use of light source: frequent switching will shorten the life of the lamp;

Ballast: The distance between the light source and the ballast is restricted, generally not more than 3 meters;

Starting current: Depending on different ballasts for HCI, HQI and NAV, the starting current of the lamp can be as high as 2 times the operating current, so this current must be considered when designing the circuit, otherwise the switch will easily trip;

Luminous flux: The parameters of the light source are relatively stable after 100 to 300 hours. The ignition position of the T type and TS type is horizontal, while the E type has a vertical lamp holder. When the light source has different ignition positions, its luminous flux, color temperature and life are all There is a significant difference;

Color deviation: For all HQI and HCI metal halide lamps, there may be color deviation between the lamp and the lamp. This color deviation is due to the influence of external factors such as power supply voltage, ballast and lamp design. Influencing factors of color temperature consistency:
Internal factors: The consistency of the arc tube (charged mercury, electrode gap, volume, status and size, etc.) determines the consistency of the lamp power and cold spot temperature, which all affect the density of the halide, which determines the relative color temperature of the lamp. consistency. At the current advanced level abroad, the relative color temperature tolerance of the same batch of light sources can be controlled at about +/-100K when it leaves the factory, while the domestic advanced level is about +/-300K. For a 3000K metal halide lamp, this difference in color temperature of 600K can be easily felt by the naked eye.
External factors: different ignition positions can differ by 600K, power supply voltage parameters, supporting capacitors, relevant industry standards, and rated power below 400W, the ballast adjustment rate must be ≤10%; but supporting Taitong lighting constant power electronic town The flow device can well prevent the color temperature deviation.
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