Masdevallia spikes blast but turn bright pink!

[Kaykay]

Anyone got any clue what that is about? I've been away for a couple of days and found a spike which was near blooming when I left blasted and Barbie pink. (Sorry, still looking for digital camera for pics, will add when I have them- I mean that colour literally, and the whole length of the spike)
Any clues as to what would have caused this? Too much light? Yesterday was dramatically brighter than the weather we've been having recently so that could be a possibility. I use distilled water, v.weak fertilizer, potted in sphagnum, high humidity (before you ask!) Temp. around 18 C day/ 12 C night.
If anyone has any ideas, please do let me know. I've never seen anything go this colour before!