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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
       
  For charging, the rear tube is unscrewed, accessing the charger socket. After removing the rear tube, the cell pack is easily replaced with a spare fully charged cell pack within seconds.
The lamps are exclusively powered by Class "A" Nickel Metal Hydride rechargeable cells. The power intensity and robustness of these cells cannot be reached by any other cells on the market at this time.
  The heart of the two lamps is the switch module which accommodates the front and rear threaded covers. The magnetic pressure switch which controls the electronics needs no penetration of the housing. A Hall sensor measures the magnetic field changes created by the movement of the switch.