The lampholders for the double-ended lamps used in the MAC 2000 series, MAC 700 Series and the MAC 550 will eventually wear out due to the high voltages that pass through the contacts. The life of the lampholder will vary, but as a rule you should plan to replace the holder every 3000 - 4000 hours.
The wear begins to show up as discoloration at the contact surfaces. When this happens, resistance increases and the lamp becomes harder to strike. If this process is allowed to continue, the lamp is likely to fail prematurely.
Inspect the lampholder when replacing the lamp and have it replaced by a qualified technician when there any signs of discoloration or pitting at the contact surfaces.
Damage caused by failure to replace a worn and/or discolored lampholder is not covered by the warranty.