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How would I know that the lamp needed to be replaced?
It is advised that you check the lamp periodically, especially toward the end of its lifetime.  For the mercury vapor lamp, check the viewport on the back of the lamp panel.  If it needs to be replaced, the lamp will flicker.  Please note that if you remove the lamp panel to check the lamp, the lamp will automatically shut off for safety reasons, so using the viewport is advised.  The quartz halogen lamp can be easily checked through the viewport.  The quartz halogen lamp does not flicker, it will be off when it needs replacement.