Ok, Ill say something....
Inherently, Purple in an SMD, radiates a light purple in the short distance and darkens over distance.
A frosted lens can help.
All Digital Cameras do very strange things when photographing Purple...exaggerating them, so people want what they see in a picture...but the actual color is more subtle.
All resin diodes...low cost 1 LED are a bit more Pinkish. Much like the OPs concern with a Superflux...also pinkish.
1 SMD from all vendors are a bit darker than a 4 SMD.
The issue are inserts. Because of the short distance from bulb to insert, purple doesnt get as dark as we want. I often receive emails on how to get a purple bulb to look like the one in Ironman.
Well, Ironman has a Purple insert, and at this immediate time a Purple bulb, under a white insert wont be as dark as a purple plastic....but there are new things happening.
I will preface this, by sharing I have spent 10 months and a couple grand testing, remixing powder endlessly, and testing maybe 60-70 different bulb types and powder mixes.
What does exist now, are Twin 2835 in Purple. They are brighter, and are a nice help in insert and GI lighting...simply brighter. Cointaker has them now, my stock should arrive next month.
With this in mind, we have a fluted Purple in 1 SMD, and Faceted 2 SMD...not a darker purple, but a starburst of purple rays.
All 1 SMD purple from all vendors, IMO are close to each other.
Op-Max is a different Beast, and in GI, I personally love the Purple...It is only about 10%-15% darker, but it throws the purple twice as far. While it does come in 555, the bulb is too tall for most inserts, especially light boards, and is so bright, it can leak light into other inserts.
So I am now on my last hope...my last test....it goes back to Ironman...
Protos are scheduled in, in a Twin 2835, BUT with a clear Purple Lens.
It is my hope, that a Purple clear lens will darken the short distance throw, making it "richer" to the eye. Opaque purple lens failed...so this may be it.
It all reminds me of this commercial: