I purchased Ikea Lock lights a few years ago for my downstairs suite since they were cheap yet stylish but  they have been recalled.  The plastic clips can break causing the glass to fall.

http://healthycanadians.gc.ca/recall-alert-rappel-avis/hc-sc/2016/57056r-eng.php

https://www.cpsc.gov/en/Recalls/2016/IKEA-Recalls-Ceiling-Lamps/

http://www.ikea.com/ms/en_CA/customer_service/current_important5.html