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Fluorescent and gas discharge bulbs also have very spiky spectra. It doesn't seem like the spikiness is a problem in itself.

Fluorescent lamps are also very unpleasant, for the same reason, as are “neon” signs if you look at them up close.

Sodium lamps are much less objectionable because their spectral spikes are at much longer wavelength.

In my opinion neon lamps emit the most pleasant colors to look at.

The only sodium lamps I'm familiar with are high pressure sodium, which emit a garrish orange hue.

To look at, or read under?