What causes blackening at the ends of a fluorescent tube in the first 1,000 hours of use?
What will be an ideal response?
When there is heavy end blackening during the first 1,000 hours of operation, the active material in the filament cathodes is being used too rapidly. This may be caused by one or more of the following factors:
• Frequent starting of fluorescent lamp units.
• Starters operating improperly, causing either too short or too long a preheat period.
• Improper ballasts that do not meet specification requirements.
• Circuit voltage being too low or too high. For best results, the circuit voltage
should be within the rating of the fluorescent fixture unit.
• Improper wiring of the fluorescent fixture unit.
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