[galenlynch]

Most 'sun lamps' do not emit UVB, which is required for your body to make vitamin D.

[undersuit]

Then don't buy those if your looking for that feature?

[xdavidliu]

you're missing the point; he's saying that sun lamps don't have the same effect as the sun. This isn't just a "feature" that some lamps have and others don't; it's a crucial missing ingredient that results in the sun lamps you are suggesting simply _not working_.

[undersuit]

No, I'm not. There are UVB generating light sources and they also fall under the SAD/Sun lamp definition.