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  1. #1
    Look! My Spine! RubenX's Avatar
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    How many watts does a 50w bulb uses?

    Halogen 50w in this case.... how many?

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    Hey guyz? Guyz? Wait up!! Siu Blue Wind's Avatar
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    Quote Originally Posted by Buddha
    We are what we think. All that we are arises with our thoughts. With our thoughts, we make the world.
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    Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.

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    Look! My Spine! RubenX's Avatar
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    Quote Originally Posted by Siu Blue Wind View Post
    She's pipi and needs a diaper change... size 3 IMHO, huggies little movers will work the best. cute tho

    now back to the wattage... I've been told that halogen lights are more efficient and on the package, instead of posting the actual wattage used by the bulb, they put the aprox wattage of an incandescent bulb that will produce a similar amount of light. Supposedly, this help customers choose the right wattage for their application. If this is true, the question remains... if it's BS, then never mind ....
    Last edited by RubenX; 08-15-09 at 02:18 AM.

  4. #4
    Hills scare me. mushrooshi's Avatar
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    It could be more complicated than it looks. For example, computers:

    I have a 700 watt PSU on my gaming rig, but the most it uses up is 500w, and when its just idling it uses up 100w probably.
    Bikes are snazzy.
    I own a 2008 Giant FCR3

  5. #5
    Senior Member Michigander's Avatar
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    If you don't trust what the box says, why not get a clamp on amp meter and a voltmeter and go about figuring it out for sure?
    Bring back the Sig Test!


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  6. #6
    Life is good RonH's Avatar
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    You should have made this multiple choice or a poll.
    My bikes: 2001 Litespeed Tuscany---2015 Cannondale Supersix EVO carbon

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    Comparison of typical bulbs

    Who's to say if that study is accurate, but it should be close. The industry rating system of Watts, in practice, is now more like a rating of illumination (lumens), so the more practical comparison is lumens per watt.

    40W standard bulb measures 40 watts and 480 lumens
    40W halogen bulb measures 42 watts and 665 lumens

    60W standard bulb measures 60 watts and 880 lumens
    60W halogen bulb measures 52 watts and 885 lumens

    50W halogen isn't listed, but should be between 42 and 52 watts, probably with more light than a 50W standard incandescent bulb, if it's critical to know for sure (maybe you are choosing a battery size for your commuter bike and want to run a 50W halogen bulb), then you should measure your specific bulb.
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    Dog is my co-pilot 2manybikes's Avatar
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    How fast will my bike go?
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  9. #9
    Senior Member skiahh's Avatar
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    Who's buried in Grant's Tomb?
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  10. #10
    Hey guyz? Guyz? Wait up!! Siu Blue Wind's Avatar
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    What's heavier, a pound of butter or a pound of feathers?
    Quote Originally Posted by Buddha
    We are what we think. All that we are arises with our thoughts. With our thoughts, we make the world.
    Quote Originally Posted by making View Post
    Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.

  11. #11
    Dirt Bomb sknhgy's Avatar
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    50?

    Or you could play with numbers.

    Power = current x voltage, I think. If you know the wattage - 50w in this instance - and you know the voltage you are using, then you put the knowns in the equation and solve for the unknown. Like this:
    50w = Amps x 120 volts

    50/120 = .42 amps

    That light uses less than 1/2 amp.

    Am I correct and does that help?

  12. #12
    Pwnerer Wordbiker's Avatar
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    Quote Originally Posted by ahsposo View Post
    Ski, bike and wish I was gay.

  13. #13
    Footballus vita est iamlucky13's Avatar
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    A 50 Watt bulb consumes (or should at steady state) 50 Watts. The difference in efficiency is how much light it puts out while consuming 50 Watts. Halogens are about twice as efficient as normal incandescents.

    The packaging should also say their actual Wattage rating somewhere. That's kind of important for not starting fires...
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    Genius FlatMaster's Avatar
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    Quote Originally Posted by sknhgy View Post
    50?

    Or you could play with numbers.

    Power = current x voltage, I think. If you know the wattage - 50w in this instance - and you know the voltage you are using, then you put the knowns in the equation and solve for the unknown. Like this:
    50w = Amps x 120 volts

    50/120 = .42 amps

    That light uses less than 1/2 amp.

    Am I correct and does that help?
    You would need RMS voltage I think.
    Ride or Die

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    I think the confusion is due to CFL advertising where they say a 15 watt bulb puts out as many lumens as a 50 watt incandescent bulb.

  16. #16
    Senior Member kache_98's Avatar
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    Over 9,000!

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    Dog is my co-pilot 2manybikes's Avatar
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    Quote Originally Posted by skiahh View Post
    Who's buried in Grant's Tomb?
    42 mph down hill.

    Quote Originally Posted by Siu Blue Wind
    What's heavier, a pound of butter or a pound of feathers?
    Grant.
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  18. #18
    RustyTainte substructure's Avatar
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    What color was the old gray mare?

  19. #19
    Look! My Spine! RubenX's Avatar
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    ok, I measured it with some pretty cool equipment. Taking the voltage from 12v to 13.8v makes the wattage vary from 49.8w to 61.3 and the amperage fluctuates between 4.20a and 4.35a aprox.

    My friend suggested modulating (turning them on and off real fast with an electronic circuit) the headlamps to get better battery life... but we have no idea what should be the optimal duty cycle.

  20. #20
    Dirt Bomb sknhgy's Avatar
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    Quote Originally Posted by FlatMaster View Post
    You would need RMS voltage I think.
    I thought 120 was rms volts.

    50w= amps x 12v

    50/12 = 4.166 amps

    That's in the same ballpark as the readings from the equipment.
    I think you would need a big battery to supply that much current for any length of time.
    Last edited by sknhgy; 08-15-09 at 09:11 PM.

  21. #21
    Senior Member Nota's Avatar
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    Quote Originally Posted by substructure View Post
    What color was the old gray mare?
    If a chicken-and-a-half, can lay an egg-and-a-half, in a day-and-a-half, than how long does it take a grasshopper with a wooden leg, to kick all the seeds out of a dill pickle?
    When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished by how much he'd learned in seven years.” Mark Twain (apocryphal)

  22. #22
    Senior Member
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    Quote Originally Posted by RubenX View Post
    My friend suggested modulating (turning them on and off real fast with an electronic circuit) the headlamps to get better battery life... but we have no idea what should be the optimal duty cycle.
    Well, unless you're lighting up some poo with that, you're probably out of Foo now, try something like this instead: http://www.bikeforums.net/showthread...t=#post3438001, then read the other 1700 or so posts in total geekiness, and you'll be good to go.
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  23. #23
    Look! My Spine! RubenX's Avatar
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    Quote Originally Posted by Wilbur Bud View Post
    Well, unless you're lighting up some poo with that, you're probably out of Foo now, try something like this instead: http://www.bikeforums.net/showthread...t=#post3438001, then read the other 1700 or so posts in total geekiness, and you'll be good to go.
    Yes, there will be poo in my path and I'll illuminate it with these lights. It is important that I light up the poo very well. Otherwise I could end up riding over it, causing the poo to splatter all over the bike and the rider (not to mention the nipples of the water bottles). And talking about nipples, I'll also find nipples in my path. I shall illuminate those too, to the best of my abilities. I also wanna be able to blind squirrels with my candlepower, to confuse them and ride over them. Squirrel population shall be controlled.

  24. #24
    Señor Member USAZorro's Avatar
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    You could monkey around with the wiring and get the bulb to do the equivalent of overclocking.

    After some serious work, I think you could even dial it up to 400 watts.
    The search for inner peace continues...

  25. #25
    Look! My Spine! RubenX's Avatar
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    Quote Originally Posted by USAZorro View Post
    You could monkey around with the wiring and get the bulb to do the equivalent of overclocking.

    After some serious work, I think you could even dial it up to 400 watts.
    I might need to water cool the casing tho....

    and the rig is gonna shoot so many photons that the bike might end up riding backwards...

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