20 recess ceiling light bulbs

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PAR20 (and other size) reflector halogens are dimmable with inexpensive electronic dimmers and they provide excellent light quality--both spectrum and Color Rendition Index.

Those things aren't true for CFLs. CFLs are also much more of an environmental hazard.

If you dim PAR20s, the energy consumption advantage of CFLs is largely negated (depending on the dimming level, of course).

CFLs? Bah!