I'm buying a laser cutter with an 80W EFR tube from China and I'm considering buying a spare tube together with the machine for $200 extra.
It seems like a good idea since I assume the tube will eventually fail and then I will be out $500-600 for a new tube shipped by DHL.
I only have one concern: Do unused laser tubes leak or otherwise degrade over time? Or can I safely store a spare tube for several years?