The use of black plates is recommended for the measurement of fluorescence or luminescence in order to avoid signal crossover ('crosstalk') between the individual wells. The use of black plates also significantly reduces the variability of the results, thereby achieving a more even and more stable luminescence and fluorescence level for the respective reaction. This leads to a significantly improved reproducibility of the measurement results and therefore to increased accuracy of the measurements. lumoxmultiwell products with 24, 96 or 384 wells are suitable for the microscopic assessment of such fluorescent or luminescent tests.