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Hydromea LUMA 250LP

Fast, low-power underwater communication

The LUMA 250LP is a very compact optical modem for fast underwater communication, up to 250kbit/sec, down to 6’000m depth. Its very low stand-by power consumption makes it particularly well suited for long-term deployments along with battery-powered instruments. Fitting your subsea infrastructure with LUMA won’t dent your budget but will make access to the data so much easier and faster. It’s about time that modems literally connect the ocean!

  • Hydromea LUMA 250LP
EPFL Innovation Park / Batiment C
1015 Lausanne


The Hydromea LUMA 250LP optical modem combines outstanding performance and energy efficiency in a very compactform factor. Optical communication offers superior data rates, low latency and lowerpower requirements compared to acoustic modems. This makes it the perfect choice for applications such as data download from submerged sensor platforms (landers), as well as wireless interfacing between ROVs/AUVs and deep sea infrastructure.

The LUMA 250LP is very energy efficient, which makes it ideal for battery-powered applications. It can be configured to enter a sleep mode after a specified time of inactivity, and optically woken up from sleep by another modem when the link is re-established.

The software-configurable serial cable interface can be set to RS232 or RS485, which makes the LUMA 250LP the ideal drop-in replacement for cabled connections in many existing systems.


  • Ultra-compact and low weight, ideal for small ROVs/AUVs
  • Four transmission power levels: 2 - 5 W
  • Wide supply voltage range
  • Ultra-low power sleep mode with optical wake-up
  • Encryption of data link, ad-hoc networking (optional, on request)


  • Wireless readout of landers and subsea infrastructure with ROV/AUV
  • Low power communication for battery-powered underwater devices
  • Wireless video streaming for mini ROVs
  • Subsea networks at deep sea sites


  • Field of Use
    short-range underwater data transmission, subsea-construction, data extraction from submerged landers
  • Year of latest version
  • Operating current
  • Connector type
    SubConn MCIL6M
  • Power Supply [V]
    12V - 36V
  • Output interface
    RS232,RS485 (software switchable)
  • Operating temperature: min. [°C]
  • Operating temperature: max. [°C]
  • Housing material
  • Transducer beam shape
    120 deg cone
  • Acoustics date rate
    250 kbp/s (optical)
  • Error rate
  • Beam width
  • Maximum range (sea/fresh water)
  • Depth rating {m}
  • Stand-by mode
  • Cables
    SubConn MCIL6M pig tail
  • Additional capabilities
    forward error correction, encryption
  • Data storage

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