As per the caption, my light green pieces do glow well

. I had confused myself - not difficult - by looking at the CH reproduction of the factory catalogue showing Spring - which looks rather different to what you see in the flesh. However, think you've answered the question, insofar as my light green is indeed Spring.
Unfortunately, the author's caption to this catalogue page is keen to mention that sunshine amber is loaded with uranium, but makes no mention of this aspect when speaking of evergreen and spring.
So, we're waiting on Keith then for Bristol green
