I'm looking for ways to do [red]accelerated life tests[/red] for different types of lighting (mainly Christmas lights). [blue]How can I do this?[/blue]
Run them at a higher voltage. It is not a linear relationship though and dependent entirely upon the lamp design, (filament diameter, number of coils etc.) and quality of the power supply operating them. You may have to do a normal life test concurrently to maintain a baseline relationship.