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  1. #1
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    Very odd request for light bulb assistance.

    So - I'm new here...hi. I have a question that has nothing directly to do with bikes, but it appears that your community may be in the position to help me.

    I am actually looking for a bulb replacement for a Hello Kitty alarm clock for my daughter.
    The clock is labeled that it takes replacement bulbs of type 6V 100ma H10.

    After looking for quite some time I have come to determine that H10 cannot possibly be the vaild bulb type, but in fact it is of E10 type "MES" bulb.

    The bulb itself is labeled at 6V0.1A

    In all my searching I am inevitable led to bike forums and shops...many of them in the UK as this would appear to be a popular size and wattage for bikes.

    I'm hoping someone can tell me where I could actually purchase these bulbs - preferably in the US.

    I have found only one place to purchase them in the UK:
    6v 100ma Miniature Mes Lamp | Rapid Online

    And a single bulb is going to cost over $8 with shipping....for a bulb that costs a quarter!

    I thank you all in advance for any guidance you could provide.

  2. #2
    apocryphal sobriquet J.C. Koto's Avatar
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    too bad there's not hellokittyclockforums.net

    If you're in the US take the dead bulb to any Radio Shack or hardware store and you might get lucky finding a replacement. Those kind of bulbs used to be common in flashlights, 6V lanterns, etc.

  3. #3
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    This page should help you identify it. If you can measure the thread size, you should be good.

    Edison screw - Wikipedia, the free encyclopedia

    You just need a 6V E10 bulb (~0.6W).

    The bulb has a resistance of V/I=60 Ohm. A 24V/0.35A bulb is a 68 Ohm bulb, and would draw just under 0.1A, so it wouldn't damage the clock, not sure if it would be bright enough. It'd probably last forever though, considering how far under wattage it would be.
    Last edited by gsa103; 09-03-14 at 09:38 PM.

  4. #4
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    This is about the standard incandescent bulb for rear bicycle lamps. US bike shops were never good about stocking them even before LEDs - a hardware store might be a possibility. Otherwise, I solve such problems by soldering a white LED in series with a limiting resistor - then you do not need a replacement bulb ever again.

  5. #5
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    Quote Originally Posted by J.C. Koto View Post
    too bad there's not hellokittyclockforums.net

    If you're in the US take the dead bulb to any Radio Shack or hardware store and you might get lucky finding a replacement. Those kind of bulbs used to be common in flashlights, 6V lanterns, etc.
    Maybe I should start that forum . I did go to Radio Shack (and spent an hour searching online). The only bulb that I could find in any local store was at RS. It was the right specs but the wrong form factor (not E10).
    I'm hoping perhaps to find something equivalent...maybe using gsa's advice below:

    Quote Originally Posted by gsa103 View Post
    This page should help you identify it. If you can measure the thread size, you should be good.

    Edison screw - Wikipedia, the free encyclopedia

    You just need a 6V E10 bulb (~0.6W).

    The bulb has a resistance of V/I=60 Ohm. A 24V/0.35A bulb is a 68 Ohm bulb, and would draw just under 0.1A, so it wouldn't damage the clock, not sure if it would be bright enough. It'd probably last forever though, considering how far under wattage it would be.
    Ok...so this is where I thought someone here might be able to help - if not just on a direct replacement like is used on rear lights (as 2_i) mentioned above, then at least in offering a suggestion of what might work and not break the device.

    I haven't done electrics since HS, and I don't remember being great at it then. What you are saying though is that as long as the amperage draw is less than 0.1A then I won't damage the clock?

    Am I correct in calculating the draw as the wattage/voltage? In this case a 24V/0.35A bulb is 8.4 watts divided by 120V = 0.07 draw?
    So I can get any E10 bulb that is 12 watts or less for use on 120V device and be safe?

    Really appreciate the guidance...and so will my daughter when we get this thing lit up!

  6. #6
    coprolite fietsbob's Avatar
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    have a Radio Shack franchise store? they have an online catalog too...

  7. #7
    Senior Member alan s's Avatar
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    Quote Originally Posted by BJH75 View Post
    Maybe I should start that forum
    Couldn't find hellokittyclockforums.net, but there is hellokittyclockforums.com









    Had you going there for a second.

  8. #8
    Senior Member Looigi's Avatar
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    Quote Originally Posted by gsa103 View Post
    ...The bulb has a resistance of V/I=60 Ohm. ..
    The resistance of the tungsten filament increases with temperature, so the resistance of the bulb when not lit will be much less. About 1/15th the resistance of the lit filament or about 4 Ohm in this case.
    Ride more. Fret less.

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