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Sparrow:
Typical CFLs have one or two big bumps in their output, usually centered on their nominal color temperature, with very little output at other frequencies. Incandescents have a big bump at 2700K, with a long tail of other frequencies (off in the blue direction); they produce moderately more output at frequencies off nominal than do normal CFLs. The 'Full Spectrum Daylight' CFLs for which I've seen spectrograms have five or six big bumps in the spectrogram; that said, their output at other frequencies in the visible range is much higher than what you see from most incandescents. I predict that if you are disappointed, the issue won't be holes in the spectrogram. The more common problem is that the light seems much bluer than people expect -- we're really really used to the very yellow light from incandescent bulbs.
Xenophon
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