Mogul Screw (E39) Base Porcelain Three Way Fixture Westinghouse Socket
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This refers to the literal measure of the light-output of a particular light bulb, measured in the number of lumens.
Watts (Energy Used)
"Watts" is the term applied to the amount of energy required and used by a particular light bulb. It is an international system unit of power equal to one joule per second. Contrary to popular belief, the wattage of a bulb does not directly measure the brightness; the "lumens" of a light is what defines the actual light output.
This refers to an average lifetime rating based on large quantities in test groups. This testing takes into account usage of 3 hours per start for fluorescent lamps and 10 hours per start for HID lamps.
Voltage is a measure of electrical potential.
The "Bulb Type" is typically a combination of the style of bulb as well as the width of the bulb. Usually, the first couple letters will indicate the type; "G" would indicate "Globe", "PAR" would indicate "Parabolic Reflector"... The numbers indicate the diameter of the light bulb in eighths of an inch; a "G40" would be a "Globe" style that is "5 inches" in diameter.
The "Base" of a light bulb is the part that either screws or snaps into a receptacle. Base Type terminology may indicate common descriptive words like "Medium" or "Candelabra", or may even contain numeric codes that signify size and variety, like "E26" or "2GX13".
The filament is the style of fine wire that is heated electrically inside of an incandescent light bulb.
Correlated Color Temperature (CCT) is a specification of the color appearance of a light bulb, relating its color to that of a reference source heated to a particular temperature, measured in degrees Kelvin (K). It generally measures the "warmth" or "coolness" of light source appearance.
CRI (Color Rendering Index)
CRI refers to the "Color Rendering Index" of a light bulb. CRI measures a light source and grades its ability to render the color of objects "correctly," as compared with a reference source with comparable color temperature. 100 is perfect rendering.
This is sometimes referred to as MOL, or "Maximum Overall Length". It measures the absolute length of a light bulb, from the top of the bulb to the bottom of the base and is typically expressed in inches.
Width refers to the complete diameter of the widest point of the light bulb.
The beam angle refers to the width of the light beam coming from a reflector light bulb. The higher the number, the wider the beam spread.
# of Lamps
This refers to the number of Fluorescent or HID light bulbs that this particular ballast can light.
Bulb Type Used in Ballast
This refers to the style of light bulb that this particular ballast can light.
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6/04/13 (Brentwood, TN)
I have an old lamp that used the Mogul Screw Base 3-Way Fixture but it was burnt out. I ordered the E39 and installed it and it works great.
3/27/13 (Louisville, KY)
After describing what I needed to the sales person, she confirmed that it was the right size item for my antique lamp. It fits perfectly. I'm very pleased with my purchase, and it arrived very quickly.
1/07/13 (Austin, TX)
Just re-built and re-wired my vintage floor lamp with this porcelain 3 way fixture socket. It worked perfectly and I am now delighted to have this old lamp in perfect working order. These parts were great quality and arrived quickly.
12/24/12 (Tracy, CA)
Although I haven't installed the socket in the lamp yet it appears well made and was shipped promptly after the order was completed. These sockets aren't easy to find and I like the assortment of products that this company has to offer.
10/16/12 (East Greenwich, RI)
This socket fixture saved our antique lamp. A small modification needed to be made to the piece that screws into the rod which goes through the entire lamp stand in order for the switch to line up. Not a big deal if you are a bit handy.