Phalaenopsis leaf spots

[empiref]

Hello Fellow Orchid enthusiasts,

Hope you all had a great Christmas,

I am facing a problem with some of my SWC phals; I have an enclosed setup, under the jars I have led lights for root zone warmth, and above I have Led grow lights; I have a small pc fan for air circulation, It is on around 6 hours a day, temp is fairly stable, nights doesn't fall below 60, and daytime doesn't fall below 65, all phals are in spike.
i the last couple of days I noticed some spots on the leafs of 4 phals, the remainder 10 phals are ok; can anyone please help me identify the problem and offer me a solution?

Thank you all in advance.