Quartz devitrification

Quartz devitrification is caused by the useful life of the lamp being exceeded or the lamp being operated beyond the maximum current range

Explosion

If a lamp explodes unexpectedly, fingerprints or dust may be to blame. To avoid this problem, clean lamp envelopes with alcohol and a cotton swab if they are touched accidentally, or if they have accumulated dust or dirt. Also, ensure that lamp life is not exceeded by more than 25%; aging quartz loses mechanical strength with advancing age.

Mushroomed cathode

A mushroomed cathode is the result of excessive power supply ripple caused by a power supply phase loss, a defective power supply, or bad connections. Check the AC ripple, electrical connections, and line phases.

Melted cathode

A melted cathode is caused when a lamp is installed in reverse, (i.e. reverse polarity). When installing a lamp, ensure that the anode and cathode are placed correctly.

Uneven bulb darkening

Darkening may occur on one side of the lamp envelope if the bulb has not been rotated. Rotate the bulb 180 degrees at half-life to prevent this from occurring.

Melted anode

Typically, a melted anode face is the result of operating a bulb at a level exceeding the power range specifications. To avoid this problem, ensure the current is within the recommended operating range (85-110%).

Discolored bulb

The bulb body may turn bluish in color if the bulb has leaked. As with the discolored endcap, ensure that proper cooling procedures are in place, and that airflow is positioned correctly. Seal failure is generally caused by overheating.

Discolored endcap

Typically, a discolored endcap is caused by overheating a bulb. To avoid this problem, ensure that proper cooling procedures are in place, and airflow is positioned correctly. Also check electrical connections. Lamp bases should not exceed 225 degrees C.

Flicker

Flicker may result from a faulty lamp, unsuitable operating equipment, or incorrect operating mode. Ensure that the lamp is being operated at the recommended current, and that it is adjusted correctly. New lamps sometimes flicker when they are first installed – they must be operated for several minutes for thermal stabilization to take place.

Unable to light

Lack of ignition is caused by poor connections, low open circuit voltage, or end of lamp life. Check connections, open circuit voltage and lamp life.