How to get transparent iridescence using Cycles? I've succeeded getting iridescent with this Cycles node setup:

Physical iridescence in Cycles?

This did the job, however I need a transparent/clear iridescence like this



So I tried plugging the final output into a mix shader between Glass BDSF and transparent. However this still produces a black, barely iridescent material. 

How can I get the results below from what I have? I don't want to use code but rather stay with nodes
Don't Mix but Add your Shader to a Transparent BSDF. You may also want to multiply the Emission strength by some value less than 1: (in red my changes to Mentalist's version): 



The result: