are you using purple lights? I have seen this happen but much worse on my friends' plants from his purple lights. they looked fake at the end almost like plastic.
oh yea.... i noticed this too back in my blurple days. +1 on that note.
That is very much also a things some plants will do under the blurple LED's. Had a multiple plant Autoflower DWC grow going years ago. I ended up using blurple lights for additional supplemnting on the sides and all plants closest to them were indeed shinier in the foliage.
Still not really something you really need to worry about though unless presenting along side N toxicity, or if you've been foliar feeding
i'd vote your plants are just over transpiring a little bit though, and being a newer grower it probably has you very keenly keeping an eye out for potential problems. Using multiple smaller LED's does introduce a lot more dry heat to an environment then a single larger panel being driven by a single larger driver. There are a lot more diodes and capcitors/rectification circuits going on in that scenario, all of which produce a good bit of heat.
The only actual issue i really see on your plants is a little over transpiration stress.
For what its worth you can get 100 actual watt led panels, full spectrum, over 2.5umol, for about $35-50 now on ebay, and i can confirm they work very well and the drivers are easily sourcable and replacable too. Most even have constant current drivers high amperage rated rectification diodes, and samsung led packages, and are dimmable now at that price point as well. If you have any electronics repair or troubleshooting experience personally, there is no longer a justifiable reason imho to spend more then that on a panel. The tech is old, and easily produced with acceptable quality for next to nothing these days.
This is a panel ihave had for about 6 years and it still works fine, 100 actual watts, 2.7umol, samsung LED's. Works great in veg and flower both, dimmable. I payed $90 for it when i got it, the EXACT same panels are on ebay currently for $30. That's just what happens when you stay producing the exact same solid state technology for years on end... It get's really cheap to produce. Ram used to cost a dollar/mb, i remember those days. My current inexpensive laptop has
*16 billion* mb of ram.... It was $500 new.
i Have 6 of these cheap led panels, they're fantastic. in a 4x4 DWC grow i can reliably pull over a pound with 4 or 5 of them. I have had to replace one driver after about a year of use on one of them. It was easily sourced on ebay for $21. I had to replace a single rectification diode on another and was good as new. Only 2 issues i ever had, and you can currently buy 6 of these for under $200 shipped. I actually didnt know theyve dropped this much, im about to order a few more myself. Personally i like being able to adjust every panels height individually as i enjoy grouping multiple genetics together in single tents to contrast their differences, and im also a fan of not having to completely shut down my grow if a driver fails, and i like that in the event i DO have a failure, im not going to be out potentially hundreds for a replacement. I'll be out practically nothing financially, nor will i lose any grow time in the event.
Going the more, smaller light route, absolutely 100% for sure produces a good bit more dry heat then a single larger panel driven by a single driver... It is a more complicated, but a more redundant, more easily modifiable, and more modular setup that can serve a much wider range of potentials in a tent.
people freak out too fast just smoke a bowl and let them be I always say no matter what well excluding budrot just let them get ovet it 3-5 days so 
