Some times lamp filaments look intact, but you have to check to be sure. One method is of course, is to substitute one lamp for another, but that is not practical for the home user. The other method is to remove the lamp and check the filament pathway for continuity with a multimeter. I see all over the net that 3 years is the life of the tube, of course that is not cast in stone. Another problem is the cool down cycle of the tube, others have said that the fan cuts off prematurely. You can purchase a new tube at many sites such as Amazon. They are expensive, about 130 bucks. It also could be the power supply, and that is hard to come by as they do not make the model any more.
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Some times lamp filaments look intact, but you have to check to be sure. One method is of course, is to substitute one lamp for another, but that is not practical for the home user. The other method is to remove the lamp and check the filament pathway for continuity with a multimeter. I see all over the net that 3 years is the life of the tube, of course that is not cast in stone. Another problem is the cool down cycle of the tube, others have said that the fan cuts off prematurely. You can purchase a new tube at many sites such as Amazon. They are expensive, about 130 bucks. It also could be the power supply, and that is hard to come by as they do not make the model any more.