b. Perform the illuminator test.
Every 6 months.
Following any light bulb replacement.
a. Perform a retest if the first test results are outside the established limits.
b. Take action to determine any or all of the following causes.
A lack of cleaning.
More than one type of fluorescent light.
Discoloration of external illuminator surface with age.
c. Replace all bulbs if one bulb burns out or starts to flicker.