 This is the best way of measuring a low-pressure and high-pressure lamp.Wolff measured lamp outputs are listed here If you are purchasing a lamp from any manufacturer always ask for actual flux power output, as UVA to UVB ratios tell very little.Tanning lamps are virtually maintenance free, but must be kept clean, as UV can easily be blocked by dust drawn in from the cooling system (or from improperly cleaned acrylics shields).