When to change the projector bulb?

In fact, we're going to change out ours this week.

The current incident reading on the uncalibrated app on my phone was 10-11 lux at the back wall of the stage, with full white on the screen, and everything else off.

Without zooming, I'll be able to compare that to what we get with the replacement, even though it's uncalibrated.
 

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