Proface APL3000B - Node Box PC - Manual (Page 136)

Chapter 6 Maintenance
6-15
6.4.3 PL-3900T Series
PL units use a CFL, long-life type backlight. The actual life of the backlight however, will vary depending on
the PL’s operating conditions. It is recommended that it be replaced periodically.
The PL-3900T’s backlight cannot be replaced by the user. When the backlight needs to be replaced, please
contact your local PL distributor.
The service life (half brightness life) of the backlight when it is lit continuously at room temperature is as
described below.
50,000 hours --- approx. 5.7 years (ambient temperature: 25°C, when lit continuously)