207 SERIES

      The features of the 207 SERIES include Direct replacement for T1¾ Wedge Base F9;Ideal for industrial pushbutton switches and annunciator panels;Durable to shock and vibration;'Fit and Forget' reliability;Warm White LEDs may be used behind coloured lens as a true replacement for a filament lamp. 
      207 SERIES features water clear high intensity LEDs as standard. The single chip LED devices have been modified by the removal of the domed portion of the encapsulation (flat-topped) to provide even illumination of switches and annunciators. Non flat topped versions of 207 SERIES are also available,please contact the sales department form details.Filament Replacement LEDs have been specifically designed to meet the primary objective of providing improved reliability. As this product range is suitable for both new-build and retro-fit, (sometimes in very old systems), a wide range of illuminated push button switches and lamp holders can be encountered. Due to subjectivity, evaluation of the LED type is recommended, (samples of all standard models are available). Care should be taken to correctly simulate operating ambient light conditions to ensure that the correct device has been selected to maximise viewing characteristics such as viewing angle, colour compatibility and on/off contrast ratio.
      The forward voltage/current value of an LED 207 SERIES is dependant upon the ambient temperature of the environment in which it is operated. Therefore,care must be taken to operate the LED at the correct voltage/current values, depending upon the ambient temperature. Consequently, a recommendation regarding operating voltages and currents is given in order to address these temperature effects. This recommendation is termed 'de-rating'. 207 SERIESis usual for forward voltages and currents to be specified for ambient temperature of 25°C. However, because the values of these qualities vary with temperature, Marl should be contacted if the device is to be operated at a temperature significantly higher than 25°C.
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