The problem with using very small light sources is that they don't cast light evenly across your palette or your canvas. If you have more light on one part of your palette than another then you're mixing of values will be next to impossible. As for color, the clipped on lights would hardly be considered full spectrum so it would be impossible to have any trustworthy color mixtures on your palette. As for using these lights for linear based drawings I think they're more useful as color and value are not critical.
On the other hand, I've been known to do some pretty crazy things to get a painting done so if you ever see me in an open workshop working with a clip on light don't jump down my throat. I am always more concerned with the lighting on my subject than anything else.
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