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6v MR11 to 12v MR11

Old 06-26-05, 01:43 AM
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geopolitical
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6v MR11 to 12v MR11

Received a "ViewPoint Evo Pro" bike light 6v 10w light today and immediately took it apart. It looks like it's just an MR11 6v bulb in there. Has anyone retrofitted one of these for a 12v MR11? I'm not too terribly worried about heat buildup, I'd be using it in a relatively cold climate during the fall/winter and I'm pretty familiar with rolling my own battery packs so that's not an issue. I wouldn't want to boost wattage substantially, it's just that the available 6v bulbs are pretty limited.

Other than just swapping out the bulb. . ? Just looking to see if anyone has any advice on doing something like this. The light was free but I'd rather not break it first thing.
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Old 06-27-05, 12:36 AM
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jab
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If you're setting up your own power supply appropriate for the 12V bulb, and the 12V bulb is also 10W, I don't forsee any problems. I haven't done this specific modification, but I have worked on some 12V MR11-based bike light systems.

If you haven't already selected your new bulb, pay particular attention to the cover glass at the front of the bulb itself. Most (all?) bike lights I've seen use the bulbs with an integrated cover, usually denoted with a "C" (cover) or "FG" (front glass) in the bulb type name. If the original bulb has cover glass, pay particular attention to the geometry and thickness of it when selecting a replacement. I've seen substantial variation in the thickness of cover glass, which may inhibit your bulb housing from closing or sealing properly with the new bulb.

If you can find candidate bulbs in a local store, it may pay to drag the housing along with you to test the fit.

Best,

JAB
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