“…half of initial luminance), adjustment of brightness, contrast ratio and analogue input for flat panels as well as ambient illumination. There are many standards [1] and papers [2,3] describing the requirements for VDU use. Most of these are more descriptive or require measurement devices starting at about 1,000$ (for example GOSSEN MAVOSPOT) and reaching 200,000$ for goniometric measurements of LCDs.…”