L.E.D. Lights. The Downside?

Well, the modern daylight white LED works by creating UV light, and then allowing that to do its thing on a phosphor, much like the old florrry tube.

We know that UV light degrades many organic chemicals - bleached hair and sunburn anyone?

Unlike the old florry tube there does not have to be a glass tube around it, and normal glass is pretty grey to the more aggressive UV - the germicidal tubes ffor sterilisers have special silica tubes where the UV absorbing metal oxides have been carefully removed.

That said in a good LED most of the UV goes into making the phosphor glow, a small fraction sneaks out.

I suspect the problem, if it arises in practice, will be when LEDs allow lights to be in the chiller cabinet as opposed to on the ceiling. There may also be a problem of plastic embrittlement of light fittings  over time, I recall some early UV LEDs with clear plastic encapsulation used to go milky after a few thousand hours use.

Equally, presumably cows' udders are not created transparent for a good reason, and I suspect sunlight is a part of that.

Well, the modern daylight white LED works by creating UV light, and then allowing that to do its thing on a phosphor, much like the old florrry tube.

We know that UV light degrades many organic chemicals - bleached hair and sunburn anyone?

Unlike the old florry tube there does not have to be a glass tube around it, and normal glass is pretty grey to the more aggressive UV - the germicidal tubes ffor sterilisers have special silica tubes where the UV absorbing metal oxides have been carefully removed.

That said in a good LED most of the UV goes into making the phosphor glow, a small fraction sneaks out.

I suspect the problem, if it arises in practice, will be when LEDs allow lights to be in the chiller cabinet as opposed to on the ceiling. There may also be a problem of plastic embrittlement of light fittings  over time, I recall some early UV LEDs with clear plastic encapsulation used to go milky after a few thousand hours use.

Equally, presumably cows' udders are not created transparent for a good reason, and I suspect sunlight is a part of that.