Scientific Coatings - Broad Band Filters                                                         Broadband filters are useful for low-resolution colorimetric work or to reduce the stray light of a high resolution monochromatic. The broad band at half peak transmission can be selected to suit the particular application. The bandwidth must be kept within the bands indicated by the HW max and HW min. These broad band filters are available with the average transmission greater than 50% and band width from 30 nm to 100 nm.   Scientific Coatings - Narrow Band Filters                                                       Narrowband filters are designed to transmit the incident radiation in a narrow band and block all other wavelengths. These Narrowband filters are able to easily isolate wavelength regions of interest. Filters for flame photometry for wavelengths of sodium, calcium, lithium, potassium are available. Filters for colorimetric can be made for any required wave length in the UV-VIS-NIR range. HHV's interference filters with 10 + 2 nm band width are most useful in the measurement of photo detector response, spectral irradiance distributions, tri-stimulus values in colorimetric and evaluation of prototype optical systems.