What Is A 2x40W Light Bulb? - Electrical - DIY Chatroom Home Improvement Forum

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Old 04-30-2012, 09:14 PM   #1
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What is a 2x40W light bulb?

I have a kind of strange question: How many watts is a 2x40W incandescent bulb? Is it 40W? Why is there a '2x' before 40W?

One of the bulbs in my light fixture above the bathroom sink burned out. The light fixture uses three bulbs (decorative globe type). I uncrewed the bad bulb, and it says '2x40W' on the base of the bulb (the metal part). I went to Home Depot and they have the bulb type in 40W and 60W but both say 1x (1x40W and 1x60W). The electrician at Home Depot wasn't sure what 2x could refer to on my bulb and suggested it might be that my bad bulb was in a 2-pack package. Is that it?


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Old 04-30-2012, 09:59 PM   #2
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That's undoubtedly the case. G25 bulbs aren't commonly available in 80 watts and if that were the case, they certainly wouldn't use that nomenclature to indicate 80 watts. It's just a 40 watt G25 globe.


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Old 05-01-2012, 01:00 AM   #3
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I will give you a short and sweet answer if you see 2X40 watts it means it have two bulbs in there.

So you have total wattage of 80 watts there.

Also make sure you do not go over the wattage limit as the luminaire is posted on there.

The answer will be based on NEC ( National Electrical code ) or CEC ( Cananda Electrical code ) or ECF ( Electrique Code France )
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Old 05-01-2012, 09:23 AM   #4
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Two bulbs in where? Inside one bulb? There's only one filament, so I don't see how that could be.
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Old 05-01-2012, 11:22 AM   #5
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I am guessing that the 2x is just a random code.

Two filaments in one bub are used for "3 way" bulbs and the two filaments have different wattages to give different combinations of light.

For example 50 and 100 watt filaments where both are energized for 150 watts.

Three way lamps have a contact ring between the center contact and the screw shell base and there is a matching contact in the socket.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 05-01-2012 at 11:25 AM.
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Old 05-01-2012, 11:45 AM   #6
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The 2x is there just to make it two times as confusing. It is probably just a 40 watt bulb...
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Old 05-01-2012, 12:11 PM   #7
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My thought on this is that it is a 3-bulb fixture, but you cannot exceed 80 watts by using 2 bulbs at 40 watts each, thus leaving one socket empty. If you use 3, 25-watt bulbs, you will be at a total of 75 watts and be okay.


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bulb 2x40w 2x 40w

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