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Which way do I install a mirrored filter in the 10AU?
Turner Designs recommends installing the mirrored side facing towards the lamp to help reflect excess heat from the lamp.  If both sides of the filter have mirrored sides, use your best judgment on which side seems most reflective.  The difference in performance is extremely subtle and will not be significant to your readings.  In the case of the Excitation filter the mirrored side should be facing the lamp and with the Emission filter the Mirrored side should face the sample.  The key is to make sure you replace the filters as they were in order to ensure consistency in your readings over time.