light brown spots?

[jcolvv89]

Hey guys.. I have one of my plants outside and I checked on it today and it had some real light brown spots ( you can say tan ) on some leaves what can this be?

 

[shuggy4105]

check thre underside of your leaves for spider mites , you can see them with the naked eye or a magnifying glass.
do you spray water on the foliage with the lights on? this can cause little spots which mimic the mites problem.
what`s the ph of your run-off? ph etc
more info please...pics would be nice