After wiring the lamp for use, operate it for about 10 hours at rated voltage or current to
stabilize its spectral characteristics. Several days later, perform standard lamp tests using the new
and remaining old lamps. When routine standard lamp tests are performed the next several times,
all lamps should again be used since it is important that sufficient valid comparison data be
obtained for the new lamps before incorporating the lamps into the routine spectrophotometer tests
programme