I dont know about purple. Ive never managed to get one of the swatch books from Lee in the UK, tried several times now. Thats one reason I wanted the book so I could find suitable ones then order in the proper sheet in larger sizes with the nice ones.
As for the brightness its exactly the same using a single disc as to doing the whole blade. The effect is identical between them. So whatever brightness loss you get with a disc you will get with the big sheet too. Thats one reason I now use P4's or Cree's for all my white blades. Best balance for size and power currently.
The red gel with a red led doesnt lose much either, not a visible difference anyway, maybe 3-4%, minimal really.
Im still trying to find a supplier of a decent blue and green as the shades I have seen available are a bit on the darker end of the spectrum as thats what is normally used in theatres etc.
The yellow is cool though
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