Hi, my name is Mike and I have been in the home improvement and repair field for 20 years. I will be very glad to help you today. There may have been a tool that came with it upon installation. If you do not have the tool this is the tool that is needed to remove the cover. http://www.espares.co.uk/product/es1123507/lamp-cover-remover-tool?SearchTerm=bosch%20light%20removal
Let me know if that is helpful to your situation and if not please communicate as so. I will continue to assist until the problem is solved. Mike
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