Lumens (light output)
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.
Average Lifetime
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.
Volts
Voltage is a measure of electrical potential.
Bulb Type
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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.
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Base Type
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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".
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Filament Type
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The filament is the style of fine wire that is heated electrically inside of an incandescent light bulb.
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Color Temperature
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.
Length
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
Width refers to the complete diameter of the widest point of the light bulb.
Beam Angle
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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2/25/13 (Carlsbad, CA)
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Excellent light bulb. A warm light, not pink or blue. We have several of these throughout the house in table lamps. The 30 watt setting makes a nice night lite for the hallway.
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Customer recommended! |
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Sometimes you need that unusual size bulb that you can't find anywhere. This fits the bill perfectly.
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Customer recommended! |
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The Westinghouse 30/70/100 watt bulb was exactly what I needed. The 3-way fits small size hurricane lamps perfectly. I was no longer able to purchase this size bulb in any stores. I was so happy to locate the product with eLightBulbs. Thank you so much!!
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Customer recommended! |
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Purchased for several small lamps that will serve as accent lamps and/or reading lamps. The three settings give just the right options.
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Customer recommended! |
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This bulb fit perfectly in my tri-lamp and works on all three levels.
I had searched high and low for the size; so happy to know that I can count on you.
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Customer recommended! |
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Perfect fit for lamping a fixture needing a shorter 3-way bulb than most vendors supply over the counter.
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Customer recommended! |
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Just what I was looking for. These are getting harder and harder to find for my decorative lamps. Fast service, great price!
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Customer recommended! |
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Great service, great product, great price. I recommend this to all who need this product, price, and service. I will buy again.
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Customer recommended! |
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I couldn't find the smaller size (A19) 3-way bulbs at any store. These, however, fit nicely into my small lamps without touching the lamp shade bracket.
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Customer recommended! |
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These light bulbs were hard to find in any store they just didn't carry them even the big box stores, I'm happy that eLightBulbs exists...
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Customer recommended! |
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