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Old 07-23-2012, 02:09 PM   #1
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Is this a 50W or a 150W light bulb?


I found this old large light bulb, but can't tell if that dark thing in front of "50W" is a number "1" or some symbol I don't know about.
I want to plug this into a 75W socket, but am afraid it'll melt the socket...



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Old 07-23-2012, 02:20 PM   #2
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Is this a 50W or a 150W light bulb?


Its hard to tell by picture but compare the "one" in the wattage to the 1 for the 120 volts

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Old 07-23-2012, 03:18 PM   #3
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Is this a 50W or a 150W light bulb?


It sure looks like 150W from here.
do you have an amp meter?
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Old 07-23-2012, 03:46 PM   #4
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Is this a 50W or a 150W light bulb?


Quote:
Originally Posted by TarheelTerp View Post
It sure looks like 150W from here.
do you have an amp meter?
No, but I can get a hold of one. So I can use an amp meter to read the wattage on a bulb? how do I do that?
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Old 07-23-2012, 03:49 PM   #5
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Is this a 50W or a 150W light bulb?


Quote:
Originally Posted by guisauer View Post
I found this old large light bulb, but can't tell if that dark thing in front of "50W" is a number "1" or some symbol I don't know about.
I want to plug this into a 75W socket, but am afraid it'll melt the socket...


No company I'm aware of manufactures a G40 globe in a 50w. They are very common in a 150w however so that's likely what you have.
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Old 07-23-2012, 06:20 PM   #6
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Is this a 50W or a 150W light bulb?


From the surface area of the globe it's a pretty high wattage. Notice how big a 10W bulb is.

For a 120v, 150W bulb the cold resistance is ~(120^2)/(150x12) = 8 ohms, for 50w it's 24.
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Old 07-23-2012, 08:12 PM   #7
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Is this a 50W or a 150W light bulb?


Do you have a digital type multi meter ?
If so, measure the resistance and compare it to any other
150w incandesant light bulb.
they should be simulair.

Judgeing by the size of the glass envelope,
I would guess it is a 150w bulb !
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Old 07-23-2012, 09:29 PM   #8
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Is this a 50W or a 150W light bulb?


Screw it in to a socket turn it on...if its really bright...its 150W.
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Old 07-23-2012, 11:40 PM   #9
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Is this a 50W or a 150W light bulb?


Alright, thank you guys for your help!
I'm pretty sure it's 150W.. Didn't know they were so cheap, so I'll probably just get a lower wattage G40 bulb just in case...
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Old 07-24-2012, 01:13 AM   #10
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Is this a 50W or a 150W light bulb?


The other thing you will not see very often anymore is a 150 watts G-40 bulbs anymore that is getting very rare now.

They will be pretty bright when you first turn them on.


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Old 07-24-2012, 07:37 AM   #11
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Is this a 50W or a 150W light bulb?


I'd just about guarantee that's a 150W bulb. I have one here that looks exactly like it. It's BRIGHT!

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Old 07-24-2012, 12:28 PM   #12
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Is this a 50W or a 150W light bulb?


150 watts was pretty standard in the 75/100/150 watt bulbs we all grew up with. You guys can sure complicate stuff. And yes. It says 150 watt right on the bulb.

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