The leaf symptoms in the photos reflect a problem with the roots. It may be nothing more than some damage that was done when you repotted. If so, there should be a decline in the number of leaves affected and new leaves should be healthy as the roots slowly recover.
However, the root problem could be more serious. As Daisy stated, it may be that the roots are drowning from too much water.
The light appears to be appropriate and there is no evidence of spider mites in the photos. Concentrate on proper watering and avoid doing anything extreme to fix it instantly. Remove the fertilizer sticks as they will aggravate the problem.
