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Exposure of cell culture media to fluorescent light can cause the formation of free radicals which can damage cells. I would suggest that you give your cells a fresh supply of new media immediately after imaging in fluorescent light. I would also suggest that you transfer your cells back to a CO2 & 37°C incubator as soon as possible. To help prevent cell damage from occurring, I would recommend using a cell culture medium such as FluoroBrite that has low background fluorescence. This will reduce the need for using high laser light intensities that can harm cells.