Lamp life


tube lights

Most lamps will need to be replaced several times during the life of the lighting system. Designers should, therefore, minimize the inconvenience that occasional maintenance and breakdowns can cause to occupants. The lamps are used in a wide range of applications. The average life is often a compromise between cost and performance. Thus, the lamp of a slide projector will have a lifespan of one hundred hours, because it is important for the quality of the image to have a maximum luminous flux. On the contrary, some street lighting lamps can be changed every two years, after some 8,000 hours of operation.

In addition, the life of the lamps is affected by the operating conditions, so that there is no single value applicable to all cases. Similarly, the effective life of a lamp can be determined by different failure modes. A physical failure, such as a break in the filament or lamp, may be preceded by a decrease in the luminous flux or a change in its color appearance. The life of a lamp depends on external environmental conditions such as temperature, vibration, ignition frequency, fluctuations in supply voltage, orientation, etc.

It should be noted that the average life given for a lamp type is defined as the time after which half of the lamps in a test lot are out of service. This definition is unlikely to apply to many commercial or industrial installations and the actual life of a lamp is usually less than published values that should be used for comparative purposes only.

Efficiency:


As a general rule, the efficiency of a given lamp type improves with the increase of the nominal power, since most lamps have some fixed loss. However, the different types of lamps have clear differences in efficiency. Lamps with the highest luminous efficacy should be used, provided that the criteria of size, color and life are also met. Energy savings should not be at the expense of visual comfort or occupant performance.
Lamp With 3-7 years warranty

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