The Spectrum set contains professional flumies from both the High and Mid sets: #2, 4, 6.
 
Photonic Flumies
The Photonic Spectrum set has all the features and performance of the Essential  Spectrum set but in addition the Photonic series radiate a beautiful magical glow! 
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Wonderful for sound journeys in low light conditions.
 
Simply charge your professional flumie for 5 minutes with a UV light (or Halogen) and they will glow all night!