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What to do if you have an existing ceiling opening of 270 mm?

Our customer ITB came up with this question. The customer used CFL fixtures with a ceiling cut-out diameter of 270 mm that needed to be replaced. LUMSSION has a conversion ring for existing ceiling openings up to 240 mm, but that was insufficient in this case.
For this situation LUMISSION designed a larger ring and adjusted the spring mechanism to ensure that the fixture was hold tight in the ceiling.