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Thread: High output LEDs?

  1. #11
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    This is the center console above the rear view mirror. There are 3 bulbs, one in each of the black areas, and one in the middle. It measures about 20mm across.


    This is one of the floor well lights, it measures 8mm across


    This is one of the rear passenger reading lights, it has two lights, it measures about 5mm tall.

  2. #12
    Maximum Bitrate mushin's Avatar
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    A note about cd: candellas are a unit of intensity, and not light output. So a 10cd LED with a 30 degree viewing angle would output the same amount of light (lumens) as a 5cd one with a 42 degree viewing angle (I think I got the math right).

    Now, which should be of greater concern is up to you; I would think that a targeted light such as a reading light you're concerned about the candellas (as long as the angle is sufficient), while a flood light like the floorwell you'd be more concerned about lumens (and may what to use a diffuser to spread out the light)

    edit: ah, pictures! Looks like you already have a diffuser on the floor lights.

  3. #13
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    The LEDs on ebay all have viewing angles of <10 deg.
    lsdiodes.com has 5mm ones with 20deg.

    If I cut the domed part off, wll the viewing angle increase significantly?

  4. #14
    Maximum Bitrate mushin's Avatar
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    I'm not sure how much the domed enclosure is involved in focusing the light. But the reason the ebay LEDs have so little viewing angle is that they are cheap - or rather, narrowing the beam is a cheap way of pumping up the mcd rating, which is the only thing alot of people seem to pay attention to.

    edit: come to think of it, I don't think the dome focuses the light at all. Lightly sanding it is a common method of diffusing the light though.

  5. #15
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    So which LEDs do you recommend that I get? and how many for each of the three pictures I posted? Thanks.

  6. #16
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    e46 3 series... easy spot...

  7. #17
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    DUH hahha jk 2004 325i

  8. #18
    Maximum Bitrate mushin's Avatar
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    I'd probably go with the sflux for the floods, and 5mm for the task lights. Hard to say how many - really, just get a handful to play with and test out, and then make a informed decision on the exact type and number to use.

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    How can I visualize how bright 10,000 or 20,000 mcd is?

  10. #20
    Low Bitrate Vacheron's Avatar
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    Quote Originally Posted by mushin
    edit: come to think of it, I don't think the dome focuses the light at all. Lightly sanding it is a common method of diffusing the light though.
    Yes, it is the shaping of the parabola of the cathode inside the device that performs most of the shaping on a 5mm device. Though some very wide angle 5mm have the dome cut off as it can attempt to refocus the beam. The Superflux devices alter the distribution using the dome though.

    Quote Originally Posted by mushin
    just get a handful to play with and test out.
    I would definately second that suggestion as lighting is such a personal and subjective thing. As 5mm devices are the easiest for the novice to mount (and can be bent into different positions much easier) I would get about 20 and just play with them!

    PS, Go for Nichia if you can get them. They rock!

    I have one or two right next to me here but unfortunately, getting them to you would be tricky!

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