Contrary to what a lot of people think, U.V exposure from indoor tanning beds and the sun are virtually the same. Our bulbs ignite a phosphorus gas inside the bulb to emit U.V light, while the sun is burning other similar gases to also emit U.V light. The U.V light that reaches us past the ozone layer is typically 95% UVA and 5% UVB, this is almost the exact same as our tanning beds.
Now experts are changing their opinion about sunlight in general. This is after they realize how many problems are surfacing from hiding from the very light that created this planet and all of its species.