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If you want bright, stay with solids.100% cyan +100% yellow creates a bright green.
If your definition of "bright" does not necessarily mean "saturated," you will have to tint those colors. Note that this is one of the things at which process colors (CMYK) are the least effective.
Tinting them makes them not only less "dark" (the opposite of "bright") but also less "bright" (as in less saturated).
Try C70 + Y100
or C60 + Y100