Lighting LEDs amd spotty leaves

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Hey peeps, had the girls out for a feed last nite and all looked fine.. put them back under the LED and noticed spots on my leaves.. had to go so couldn't investigate further.. will have a look tonight.. have bought some Plant magic mange cal + today as from what iv read this is most likely issue.. can LEDs make it look like there's something there when there isn't? Or on the flip side can they highlight any probs with the ladies that u may not necessarily pick up with the naked eye??? Any1 had anything similar??
 
I grew Automaria #1 with a 90 watt UFO light made by prakasa and i noticed tiny little spots on the plant under the LED light that i couldnt notice with the naked eye in normal light and it turned out to be a calcium deficiency. I did hear that the LED's can make the plant use more of it for some reason.
 
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