The 11.7 eV lamp measures the broadest range of compounds using the MIniRAE 3000. Because of the different type of lamp window needed to allow the higher energy light to pass, the 11.7 eV lamp has a shorter life.Lamp Care: Store lamps under dry conditions to minimize attack on the lamp window. Keep the lamps clean using dry methanol; never use acetone on 11.7 eV lamps. Turn off 11.7 eV lamps when not in use, to minimize yellowing of the window. Storing a lamp in desiccator between uses extends the life of the 11.7 eV lamp.MiniRAE 3000 rented separately or available for purchase.