I'm having the same problem. I could be wrong as I'm unable to find any information about it and when I ask im usually blowen off with some non answer or that I'm doing it wrong. I think its too much green spectrum from full spectrum leds. White leds are full spectrum. I've got friends that use just the blue and red spectrum and they don't seem to be having the same problem. I know for sure the purple to black discoloration on the meaty part of the leaf is a sign of a hid light being to close. Some people who think they are in the know try to tell me it mag or potassium deficiencies but it seems obvious to me its the light damage over time. As it usually hits hardest on larger older leaves near the top not necessarily smaller younger growth at the very top and becoming worse over time. The damaged leaves also become brittle and sometimes rough towards the back of the leaf. Light has the property of knocking electrons off atoms where the affect of this decreases through the spectrums uv light does the most damage then blue, green down to red doing the least damage. Plants have two light receptors to make the sugars required for growth, blue and red. Green light is used for vegetative growth and also prevents stretching keeping the plant shot and bushy. Some plants need to stretch a little to maximize the budding sights so running green spectrum will lower yeald when flowering. Iv noted that running a bigger distance between light and plant or less wats decreased the damage. But light penatration through the plant decreased dramatically doing this. Not all leds have the same recommendation for the hight above the plants some high power leds need 24 inches or more as compared to some that have a recommendation of 12 inches. Also the rasing the hight of the light affects the red spectrum more than the others as the red spectrum will drop of faster over distance lowering yeald. I'm beginning to suspect manufacturers are pushing for white full spectrum leds as the red leds tend to burn out too fast and aren't as reliable busting their claim of 50k hours when the red leds are lucky to last 10k hours. So to get a readly available source of red spectrum they use white leds to supply the red spectrum but has the disadvantages of producing green spectrum and im beginning to think too much green which is burning the plant.

And this is the third Trinidad plant, leaves are puckered a little, but not like on the other ones, and color is normal.

The white spots are preventative fugicide don't worry about them

You might research edema. That's where the plant takes up water faster than it can release it. I think that results from excess moisture, but may also be caused by extreme moisture variations. It's not about insects or disease. I believe it isn't going to hurt production.