Painfully Bright Tanning Bed

Tanning beds, sun showers, auto irradiation booths or whatever you want to call them are big boxes full of UV lamps that people occasionally put themselves in for a variety of reasons. The current technology is just to line up a whole load of low pressure discharge lamps which are optimized for the near UV spectrum and have people be near them. These lamps aren't particularly efficient and in attempting to locally simulate the sun, they take up space and produce a lot of heat.

There's a big push in the LED world to develop high-power low-cost equivalents. The advantages would be enormous, greater efficiency, longer life and more compact designs that would likely be practical for home use.

The UV light emitted by these devices is more than capable of damaging your eyes. This is particularly true because unlike the sun, they're heavily biased toward the UV, so they're super bright in a way you can't see. For that reason, all your normal reactions to bright light don't work and you don't protect yourself.

That home tanning beds will be a thing, and that people are predictably slapdash about safety in the familiar environment of their homes, will likely lead to some cases of eye damage no matter how many warning labels you add.

To stop this, simply add a few hundred watts of LED light in the very-much-visible part of the spectrum. As long as these turn on a moment before the UV LEDs, anyone without those little goggles, or just open eyes will go "aaagh! that's bright" and promptly add goggles/close eyes, restoring the existing safety mechanism.

You can sell it how you like, "full spectrum phototherapy" "deep penetration - reaches the parts other beds miss" whatever.