PT-EX12KU, PT-EX12KE - Panasonic Projector Service Manual (repair manual). Page 22

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The LAMP REPLACE indicator will light yellow when the total lamp used time (Corresponding value) reaches 2,000 
hours. This is to indicate that lamp replacement is required.
The total lamp used time is calculated by using the below expression,
Total lamp used time (Corresponding value) = 

eco  x 0.67 +  

normal  

: used time in the Eco 1 and Eco 2 mode

normal   : used time in the Normal mode and Auto mode

You can check the lamp used time following to the below procedure.

  Press and hold the

 button on the projector or the 

POWER ON button on the remote control for more than 20 

seconds.

 The projector used time and lamp used time will be displayed on the screen briefly as follows. 

Projector used time

Lamp 2 Total lamp used time

Lamp 1 Total lamp used time

Auto

Normal Eco 1

Eco 2

✔

✔

✔

✔

Lamp used time table  in the Lamp 
control - Lamp mode

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If the non-standard lamp is used, the warning and confirmation messages will appear on the screen every startup. 
Some of the functions are limited when the non-standard lamp is used in spite of the warning.

Since the lamp is not standard, 

projector failed to read lamp data.

Continue to use this lamp?

Yes

No