Cells obtained by a 'cheek swab' are large- 30 microns across, easily. Now, in vivo (and in cultured monolayers), the epithelial cells pack together and present a cross-section closer to 10 microns.
The intensity doen't need to be low, exactly- what is important is to filter out the IR part of the spectrum and prevent dry-out. Even so, too much light is damaging to cells- not cancer, but photodamage can occur.
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