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How to power a h7 bulb from 110v? #5416015 04/28/20 09:29 PM
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joegreen Offline OP
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I have the inside of an old headlight housing that i am trying to make a lamp from. I want to use the headlight bulb as the bulb in the lamp. How can i cheaply power the 12v headlight from 120v wall power? Also I imagine if i give the headlight the full 100w of power it will be to bright?

[Linked Image]

Last edited by joegreen; 04/28/20 09:34 PM.

1978 Chevrolet k20
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1984 Mercedes-Benz 300 turbo diesel
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Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416018 04/28/20 09:33 PM
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Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416019 04/28/20 09:34 PM
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You'll just need a 12v 5a power supply (minimum) but you'll be running it at full capacity so its going to make some heat. My recommendation would be to repurpose an ATX power supply from a computer. It should have the capacity, and will be fan cooled.


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Re: How to power a h7 bulb from 110v? [Re: wymi516] #5416020 04/28/20 09:36 PM
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joegreen Offline OP
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Thanks ill look into that.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416022 04/28/20 09:38 PM
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Can you retrofit another bulb into the base of an H7 bulb? Im thinking something with a candelabra base, so its small, and then just wire up 120 to the back of it.

How critical is it to have the automotive bulb be in there? I see its a reflector, so hot spot location is somewhat important, but to what extent?

Since youre not driving with it in a lamp, Id look at the LED H7 options. Even if illegal and slightly different beam pattern, it will likely drop your power requirements and heat load to 35W or so, which might make things easier.

Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416027 04/28/20 09:45 PM
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doitmyself Offline
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100 watts at 12 volts is about 8.3 amps. Would it be best to search for a "12 volt 10 amp power supply"????? Or, am I missing something here.

Edit to JHZR2 below: he mentioned in the OP running it at 100watts. There are 100w bulbs: https://www.amazon.com/HELLA-100WTB-Wattage-100W-Wattage-H7/dp/B078SJJQHR

Re: How to power a h7 bulb from 110v? [Re: doitmyself] #5416032 04/28/20 09:55 PM
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Originally Posted by doitmyself
100 watts at 12 volts is about 8.3 amps. Would it be best to search for a "12 volt 10 amp power supply"????? Or, am I missing something here.


Since when is a (legal) H7 bulb 100W?

Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416038 04/28/20 09:58 PM
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97prizm Offline
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You'll need an A/C to DC converter not sure what else


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Re: How to power a h7 bulb from 110v? [Re: JHZR2] #5416044 04/28/20 10:04 PM
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joegreen Offline OP
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Originally Posted by JHZR2
Originally Posted by doitmyself
100 watts at 12 volts is about 8.3 amps. Would it be best to search for a "12 volt 10 amp power supply"????? Or, am I missing something here.


Since when is a (legal) H7 bulb 100W?

My bad it's actually 55w


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: How to power a h7 bulb from 110v? [Re: JHZR2] #5416048 04/28/20 10:10 PM
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joegreen Offline OP
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Originally Posted by JHZR2
Can you retrofit another bulb into the base of an H7 bulb? Im thinking something with a candelabra base, so its small, and then just wire up 120 to the back of it.

How critical is it to have the automotive bulb be in there? I see its a reflector, so hot spot location is somewhat important, but to what extent?

Since youre not driving with it in a lamp, Id look at the LED H7 options. Even if illegal and slightly different beam pattern, it will likely drop your power requirements and heat load to 35W or so, which might make things easier.

I think having an automotive bulb would be cool but my main issue was I could not find another 110v bulb to fit into the opening as its only 20mm wide.
[Linked Image]
[Linked Image]


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416057 04/28/20 10:39 PM
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There have been conversions to h11 bulbs, which supposedly have better output. There are adapters. Looks like a bosch or hella projector out of an older Audi.


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1984 Mazda RX-7 Spec 7
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Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416061 04/28/20 10:59 PM
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You need a 110V to 12.6 volt step-down transformer.

Try this company, its 12.6 volts 5A or 60 VA.

https://www.parts-express.com/12v-ct-5a-power-transformer-(63v-0-63v)--120-205?gclid=EAIaIQobChMIsdiZjd-M6QIVhYbACh3g9gMrEAQYBCABEgLoCvD_BwE

Last edited by MolaKule; 04/28/20 11:15 PM.

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Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416072 04/29/20 12:13 AM
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Originally Posted by joegreen
Originally Posted by JHZR2
Can you retrofit another bulb into the base of an H7 bulb? Im thinking something with a candelabra base, so its small, and then just wire up 120 to the back of it.

How critical is it to have the automotive bulb be in there? I see its a reflector, so hot spot location is somewhat important, but to what extent?

Since youre not driving with it in a lamp, Id look at the LED H7 options. Even if illegal and slightly different beam pattern, it will likely drop your power requirements and heat load to 35W or so, which might make things easier.

I think having an automotive bulb would be cool but my main issue was I could not find another 110v bulb to fit into the opening as its only 20mm wide.



What I’m saying is to use the base of an H7 (capsule, element, electrical connections removed) to retrofit a Female candelabra base bulb (screw in but much smaller than a standard light bulb socket to it.

Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416094 04/29/20 02:54 AM
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Could use something like this bulb, with the requisite connector, which I found on amazon as an 6 pack for $8.

https://www.homedepot.com/p/Feit-El...ht-Bulb-2-Pack-BPQ50-G8-2-HDRP/309695015

Another option is to take a Dremel to it and open it up a bit.

Last edited by Skippy722; 04/29/20 02:56 AM.

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Re: How to power a h7 bulb from 110v? [Re: joegreen] #5416166 04/29/20 07:44 AM
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A relatively common antique dumb 12 volt battery charger will run it, just make sure it’s 10amp+

Should be cheaper than many other options.

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