HP-29C - Brighter LEDs?

[GreyUser]

C models, non-C, doesn’t matter. The display intensities vary. Period.

The variability is in the LED assemblies, at the diode chip batch level. This is true for almost all HP led products, they have intensity code letters, even todays Avago (now Broadcom) fiber optic transceivers.

While the 21 typically got the lower intensity displays, some are more noticeably bright than others. Now, somewhat off topic, the really special displays have an HP logo as the decimal point. That’s documented in the archives, somewhere. They were in the 19C, IIRC.