Oncidesa - Discolored but firm pseudobulbs - rot? viral?

[merbyderby]

Ah! It DID recently get relocated directly under a lower grow light for a few hours, thanks to one of my kids "helping". I moved it back, but the timing aligns.

Thanks to both of you - I've only had my orchids get a purple-ish tinge from too much sun but haven't seen a pseudobulb get it like this. So much to learn...