flashlight bulb replacement


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Old 03-01-19, 07:07 AM
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flashlight bulb replacement

This seems very minor but I am curious. I have an old cheap flashlight but I like it. The bulb burned out or broke so I was going to replace it. Here is the curious thing. The light takes 4 AA batteries (obviously totaling 6V). The original bulb says 4.5V 0.35A. I see a couple incandescent replacement bulbs available for about $5-$6 but its not worth it. I would just buy a cheap new LED flashlight. I also saw some LED replacement bulbs on ebay for a couple dollars. My question is what voltage bulb LED bulb should i look for? 4.5v or 6v? If I buy the 4.5v and use it with 4 AA batteries, will I burn it out or maybe get a brighter light? I am just confused that original bulb said 4.5v while there are 4AA batteries in the light.

- Peter
 
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Old 03-01-19, 09:03 AM
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According to what I'm seeing at The Candlepower Forums, too much voltage will fry an LED bulb.
 
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Old 03-01-19, 09:19 AM
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Incandescent bulbs are pretty forgiving of different voltages. LED's not so much. If purchasing a replacement bulb I would get one for 6v.
 
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Old 03-01-19, 10:53 AM
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In my earlier lifetime I have seen different voltage flashlights many of which had incandescent bulbs of lesser voltage than the respective number of battery cells. For example a bulb stamped 1.3 volts for one battery, 2.5 volts for two batteries (3 volts), and 3.8 volts for three batteries providing 4.5 volts.

I suspect that the reason was to provide more light output at the cost of a bulb lifetime less than normal. Also, the battery as it wears down can be kept in use longer before the bulb light output drops too low due to lower voltage.

An incandescent photoflood bulb is one designed for a lower voltage than the fixture and/or power system should provide. A typical life is 4 hours. A long life incandescent bulb is designed for a higher voltage than the intended circuit provides. It gives less light than a "standard" bulb of the same wattage.

Tomorrow's topic. Full retirement age versus signing up for Social Security earlier and getting a smaller monthly benefit, or delaying collecting Social Security and getting a larger monthly benefit..
 
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Old 03-03-19, 08:28 AM
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Tomorrow's topic. Full retirement age versus signing up for Social Security earlier and getting a smaller monthly benefit, or delaying collecting Social Security and getting a larger monthly benefit..

Tomorrow was yesterday. .........
 
 

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