Blue Lights on PSAudio Components

I realize that I may have have a touch of OCD, but why do the blue (power button) lights on my PS Audio components stack (DSD, BHK Preamp, P12 Power Plant) have different intensity/brightness levels?
It seems to me that all of these PSA components would have used the same bulb/voltage rating, so why are they not visually the same brightness?

I have 4 devices in my source stack and they are all different intensity. James facilitated a button board to address my PWT dimness. The new board made no difference unfortunately so it’s something else.

I thought it had something to do with changes in the pic code with firmware updates.

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They are also affected by settings in the component.

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