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  Hartenberger Unterwassertechnische Geräte GmbH - The specialist for underwater lights
The Hartenberger power tube lamps mini / medi electronic
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  Power tube lamps
mini / medi electronic
       
  These changes are then decoded and an illumination is produced that is relative to the movement of the switch, (the more the switch is depressed, the brighter the lamp illuminates).
The standard 20 watt HLX high power halogen Bulb is supplied with a controlled over voltage. The Bulb effectively has more than a 30% increase in illumination.
  A discharge protection switches the lamp off and prevents the voltage in the cells falling below 0.9 volts, before this occurs however, a low capacity warning informs the user with 3 blinks of the halogen Bulb of the imminent end of the burn time. The lamp can then be switched over to a reduced power setting, thus extending the time before the lamp turns itself off. The switch also allows signals to be sent using the Morse alphabet. It is also possible to activate the automatic SOS distress signal, (3 x short, 3 x long, 3 x short). The switch can be deactivated preventing the lamp from inadvertently being turned on, for instance during transportation.