This has been identified as a significant issue here in Oz, and back with the 2013-14 RT models (and maybe some later??) there was even a 'recall' on them, altho it may have been a 'Gratuitous gesture from BRP Australia' for a certain time, but soo many Oz bikes back then had this issue that BRP was replacing them free of charge for a while. I believe the cause of the hazing for our Low beam lights in particular has something to do with how close the outside of the projector lamp housing is to the polycarbonate lens cover on the RT's, so it's the heat radiating from that which is causing the haze on the inside of the lens cover. It's certainly not so obviously or quickly prevalent on other models or where RT Owners have replaced those light globes with LED's - less heat, less hazing (it's just a shame that the light beams from LED's, while nice and bright up close, don't 'throw' as far down the road!
)
But you should consider yourself lucky if you've only got the hazing
@askitee - I had noticed the hazing beginning and had even touched base with our local State's 'prime dealer' to initiate the replacement process for my '
still factory installed and completely OEM light assemblies and headlight globes' when I went on the Annual Toy Run just before Christmas (years ago now, I can't remember which, but maybe 2016/18 or thereabouts??) and as usual, even tho we were only travelling about 40 kph for most of the day's ride, I rode with my headlights on High Beam
ALL DAY in the heat and with little airflow over the lights (and before anyone complains about me running high beam during the day, more people see/notice vehicles with their high beam lights on; and besides, during the day, high beam is not as bright as the sunlight here, so it's not an issue at all
and it is actually recommended by our local State Authorities & Police as Good Practice for Safe Riding) and when I got home that evening after about 8-12+ hours of slow riding in the heat/bright sunlight,
I discovered that each High Beam light had a melted and burnt hole in the poly lens cover right at the light beam's focus point on the inside of the lens/cover!! 
(I did post pics here waaayyy back then, I'll see if I can find them.
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Anyhow, to wrap this up, after taking pics & sending them off to BRP Oz, the local dealer ordered and eventually replaced all of my light assemblies (both upper/high beam & lower/low beam assemblies) free of charge, but I really don't ever recommend you ride slowly all day on a hot day with your lights on High Beam!
Ps: if you do a little searching, there is some earlier discussion on this already posted on the Forum that might help.
) until you get the lights fixed... again, and once more, at your expense!! 
