Recent content by cpassuel

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    4000 lumen Canister dive light

    You can use for example skyrc imax B6AC or B6 type of charger (preferably genuine one), it supports balancing if you battery pack has wires for balancing.
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    I do not know what is the best driver for two types of LEDs

    Hello, With your 11,1v battery, you need a linear driver for the first led (eg. battery voltage is more or less led voltage) and for the second led, you need a buck driver (led voltage is smaller than battery voltage). There are good led drivers at taskled. There are several drivers available...
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    Testing coatings for flashlights ...

    Hello Will, First of all, thanks for this thread, it's very interesting and very informative. I'm wondering if you made some tests in salt water to see how it could behave in the sea ? I'm thinking to use this kind of coating for an homemade diving lamp.
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    Cooling questions and concepts

    Lucca, In your drawing, you say LED must be right over the water flow but not on metal. What do you mean by not on metal ? Do you mean to use some thermal pad between LED and heatsink or something else ?
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    Cooling questions and concepts

    Thanks for this detailed answer. What happens when time goes on, the temperature differential will probably drop ?
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    Cooling questions and concepts

    Yes, you have to maximize external surface of the lamp (with grooves for example) because water flow will cool the body's lamp (conduction). That's why fins inside the lamp are useless because there is no air flow. I found a very interesting document with lots of examples about heat transfer...
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    Cooling questions and concepts

    Hello, I'm thinking about crafting a dive lamp, or to mod a old broken halogen lamp and I have some questions about cooling LED (especially with COB LED) dive lamps . Which design is better for cooling ? Thin heatsink or thick heatsink (see picture below)? Of course it is probably related to...
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    Dive lights finished but

    Hello, You can add a protection circuit on each individual cell or a protection circuit for a pack of cells. Here are some protection circuits : http://www.all-battery.com/protectivepcbsforli-ionandli-polymerbatterypacks.aspx You can find more references in the DIVE-LIGHTING-LIBRARY
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