Sorry for long reply!
UVB only treatment is also called TL01. I had that when bf as the puva tablets are very strong and not worth risk in in breast milk.
It didn't work well for me which enabled them to determine my allergy is mainly uva, but does WORK well for some ple sufferers.
Usual treatment for puva is 2 x week for 4 weeks but as its also a treatment for psoriasis I once had it for longer to get rid of psoriasis and my ple was so much better that year.
So now they give me 7 weeks every year with a slower increase in dose each time than the normal regime. I'm glad my skin is better but I'm always so fed up of the 20 mile round trip and wearing dark glasses all day by the end of 7 weeks.
The reason I'm mentioning it is that if your PLE is severe a longer period of treatment with a slower increase in dose is something you could ask for.
If I win the lottery I'll go abroad every other week to top up my tan. If I kept a tan I wouldn't need puva every February.
I'mstuckherenow I know exactly what you mean! My skin tells me if it's had too much uv, it's hard to explain but a feeling of discomfort and a bit of panic, ie I've got to get to the shade NOW, makes people think I'm weird but saves me from accidentally getting covered in rashes.
As PP said, once you've got the reaction, that's it for the rest of that YEAR fir that patch of skin. So I'm super careful spring and early summer and get wild and careless in Sept/Oct as by then I don't care, skin is stronger and if i get it, it'll only be for a week or so.
Some people wonder if they've got ple or a heatrash. Heatrash will go after 3 or 4 days. PLE rashes stay a week to two weeks. Once you've got them, creams can make it worse, I find cold water the only thing that helps.
Also, finally, I find the heat can be an issue. Once I've had sun on my skin I need to keep my skin cool. No skinny jeans, no hot baths/showers, not hot shops (I'll often walk in and straight out of a shop in the summer if the ac is off, as my skin will prickle the minute I walk in). It lovely in October to start having hot baths and showers again.
I was told when diagnosed early 20s that I would grow out of it. I'm 51 and thought that meant about now, but the consultant said ah yes, people do grow out of it but you're a special case. Gutted.
I'm hoping someone invents a pill that creates melanin, I'd happily be their test person as this rules my life Feb to October!