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How to connect two Lumen subsea lights?

Hi @rjehangir, we are building an awesome dropcam (500 depth max), using several of your products. We thought one Lumen would be enough, but later on we understood that two Lumens would do much better. We purchased two lumens separately and now we want to connect them (daisy chain). The problem is I don’t know how to open the Lumen (I removed all the screws but no way).

Could you let us know how to open the Lumen, or should we return the two lumens and buy a set of two, already connected?

Thank you,


Hi Rafa,

There are two ways to do this. The easiest way is to use a separate penetrator for each Lumen if you have enough penetrators available. Then, you can connect the wires internally.

If you want to daisy chain them, you will have to do the following:

  1. Remove the four rear screws on one light and pull it open.

  2. Remove the blank penetrator from that light and replace it with a potted penetrator with the cable from the other light.

  3. The internal connectors on the PCB are insulation displacement connectors. You can use a flat headed screw driver to insert the new wires into the empty connector on the opposite side of the board from the one that is already used.

  4. Close the light again and fasten the screws. Be careful not to overtighten them as they are aluminum and are relatively fragile.

If the lights are still new, you are welcome to return them and exchange for a complete set as well!


Hi Rusty, many thanks for your answer. We have enough penetrators to use two for the lights but we liked the idea of the daisy chain and work only with one penetrator. Our most basic problem is in step 1. Once we remove the rear screws, we don’t know how to pull the electronic circuit out of the cilinder. We don’t know what we could break if pull the wrong way. Could you give us a hint on how to open the light?

By the way, we wanted to buy 40 inches of the same cable that comes with the light (4.2mm diameter) to do the burnwire but it is not easy at all. Is there a way we can buy you three feet of this cable? Alternatively, you could guide us to buy this type of cable somewhere else?

Pau and Rafa

Pau and Rafa,

Sorry for the delayed response! You can pull the end-cap off by grabbing the two blue penetrators and pulling outwards. We use plastic jawed pliers for this to avoid any damage. Once you get it out it will make more sense on how to proceed.

We have the Lumen cable available here: https://www.bluerobotics.com/store/cables-connectors/cables/cab-a-3-22awg-r1/

Let me know how it goes!


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No worries at all. We ended up installing the two lights separately, and this gives us more control in case we want to activate one or two lights. We already potted the cables in the penetrators.

All is fine,