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HOME > PRODUCTS > LAMPS & LEDs > LAMP TESTING

GLOBAL POINT TECHNOLOGY 
Lamp TESTING

The equivalent lifetime for lamps for rated voltage is determined by:

Lo = L ( V ÷ Vo ) n

where

Lo ............................Life at rated voltage

L  .............................Life at test voltage

Vo ............................Rated voltage

V ..............................Average voltage during life test

The value n is defined by the IEC (International Electrical Commission) specification, "Tungsten Filament Lamps for General Use,” as 13 for vacuum lamps and 14 for gas-filled lamps.

The value of n is defined by the IES (Illumination Engineering Society) Lighting Hand Book as 13.5 for vacuum lamps and 13.1 for gas-filled lamps.

 

Vibration Test

All specifications must be met before and after a 30-minute vibration test. 
Test conditions are:

• Frequency cycled: 2,000 rpm
• Amplitude: 2mm
• Motion: up and down, forward and backward, right and left with the lamps mounted on a horizontal plane.

 

Shock Test

All specifications must be met before and after a shock test (lamps dropped onto a board). 
Test conditions are:

• Drop height: 20cm

• Number of drops: 3

 

Burn-in (Aging)

Aging is an important procedure for stabilizing the quality of the lamps after production. During the first few lighting hours the characteristics of the filament of an incandescent lamp can fluctuate widely. Each lamp must meet all specifications after aging. Aging will also detect short circuits and vacuum leakage. Sufficient aging is required for the filament of a vacuum-deficient lamp to evaporate and blacken the inside bulb glass.

Each lamp is continuously lighted for two to 10 hours in design voltage, according to its average life and application.

Subminiature lamps & LEDs