First, the shape of the glass is important. If you have a T6 bulb, the "T" designates the shape of the glass, and in this case you can think of "T" as being the designation for tubular. So, florescent bulbs come with designations like T8 or T12, meaning they are tubular as well. Most, but not all refrigerator bulbs fall into this tubular shape and also use the "T" designation. A standard household lamp for example uses an "A" designation.
But, what's the number that follows the letter? It refers to the size of the glass measured in increments of 1/8 of an inch. So, a T6 refrigerator glass has a tubular shape with a diameter of 6/8 of an inch, or simplifying to a better fraction, 3/4 of an inch. You can measure the width of the glass with a ruler and get pretty close, or if you are really savvy, use a vernier caliper or a micrometer. My refrigerator uses T6.5 bulbs. So the width of the glass would be 6.5 divided by 8 or .8125 inches. You may want to use a caliper in this case but you can also eye ball it between 3/4 of an inch and 7/8 of an inch and be good enough. A T10 bulb will be tubular with a 10/8 diameter or 1 1/4 inches. T6 and T6.5 bulbs are close enough where they may be interchangeable but just remember that the T6.5 is just a tad bigger in width. So now we know all we need to know about the glass.
The base or contact part of the light bulb can also seem complicated. But, most use the screw in type, and you guessed it, they have a letter designation for the shape. The screw in type has an "E" designation and will have a number that follows it. There are only a few common sizes although technically there could be many. The number that follows is the diameter or width of the base measured across the threads in millimeters. My refrigerator base measures about about .645 across the width. Multiply this number by 25.4 and rounding to the nearest millimeter, gives us 17 mm. So my refrigerator bulb has an E17 base. Similarly, a regular household lamp bulb measures 1.020 inches. Multiplying this number by 25.4 converts that number to 26 mm, and would have an E26 designation for the base. Other common sizes are E12 and E17. The E12 base measures about .472 inches and the E17 measures .669 inches. The E17 base carries the name "intermediate base", and the E12 carries the name "candelabra" base which you may see instead of the technical designations for the base. So, now you know too much about bases.
The page here selling this bulb does not give us any information to help us to buy the right part. They do give us the voltage and wattage which is also important but not giving us the the size information is the hope that he will sell more bulbs with people not knowing what they are getting, and not returning it for being the wrong size. From the picture I would guess it is a T6 bulb, but it could also be a T6.5 bulb. But, pictures can be deceiving. Also, most of these bulbs are 40W and shouldn't create a problem in any refrigerator or freezer because they are not on long enough to cause a problem, and give plenty of bright light.
One last note about temperature, for the most part I don't know if there would be anything special about a "sub-zero" designation. Just about any incandescent bulb should work fine in the cold environment. Most of what I have heard has to do with concern over expansion and contraction but without going into the technical aspects, any one of these incandescent bulbs should work fine in a refrigerator or freezer, so shop based on size first, then price and availability. Most automotive bulbs are made the same way and work just fine in weather well below zero degree's F.
Note, I gave this 3 stars because I had to give a rating and I have no idea how good these bulbs are. I did not want to skew the data.
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Just a warning to others who may do what I did.I own a Subzero Built-in side-by-side (BI-48SD). One of the two bulbs in the main part of the fridge burnt out so I jumped on Amazon and searched "Subzero Replacement Fridge Bulb" and this item was the only one that popped up. "Perfect, Add to Cart...".
Unfortunately, this bulb is NOT the right size for the Fridge ceiling! The screwbase was too tiny (T6). On further research (way too hard Subzero's website is not easy for Bulb information very helpful for Water Filters), I learned that I needed just a standard T10 (1.25" diameter) bulb, which I was able to locate at my local grocery store for $3.79 (Feit 40W T10 Appliance Bulb).
It appears that this bulb sold on Amazon (T6 is 3/4" diameter) is either for the crisper drawer or a different model SubZero fridge than what I have. So pull out your ruler and check your dead bulb before you buy. As for me, I'll probably hang onto my mistaken bulb till my crisper burns out! :-)
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This bulb works great in my deep freeze.I have to write 12 more words to submit this review.
Twelve
Honest reviews on LIGHT BULB 40W 120/130V REPLACES SUB-ZERO BULB 7014647 , 5300136187
What can I say? It arrived very fast, was packaged great for protection, and it lights up the inside of my freezer just fine. : )Find helpful customer reviews and review ratings for LIGHT BULB 40W 120/130V REPLACES SUB-ZERO BULB 7014647 , 5300136187
NOT MUCH TO SAY THE REPLACEMENT LIGHT BULBS ARRIVE ON TIME, IN 1 PIECE AND WORKED. INSTALLED IN A 15 YEAR OLD SUB ZERO SIDE BY SIDE REFERERATOR
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