Can I use the vibrant reds on lighter blonde base colors?

Yes, but there are special precautions that must be taken to ensure the hair's integrity.

When dealing with very light, very porous hair, there are special precautions that must be taken.  A conditioner should be applied to the hair not in foils (to act as a barrier) while the color is processing.  The foils must be removed carefully, and the color must be wiped off the hair before shampooing the rest of the hair to avoid the “staining” of the blonde hair with these vibrant reds.