Leaves are burnt by direct sunshine especially in winter. The best and only solution is to adjust light intensity. Sudden strong suh shine causes sun burn trouble as shown in this photograph for leaves without trichomes. This trouble is rare for plants which is rich in trichomes on their leaves. Sun burn might be avoided by increasing sun light gradually. Looking at local photographs, most tillandsia live semi-shade condition but still there are tillandsia which lives under the direct sun light. So we need to check their original characters.