This filter series was designed to increase brightness without a corresponding increase in noise. By increasing the number of interference cavities in both the excitation and emission filters, we have created filters with steeper passbands. This allowed wider excitation and emission filters which were spectrally closer together than the Standard series. Wider and steeper filters provide more excitation and capture more fluorescence, resulting in greater signal to noise. This unique design also allows for the excitation/dichroic/emissions to be placed closer together for those dyes with a very short Stoke's shift.