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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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4/20/15 (San Francisco, CA)
It's hard to find these 25W 48" bulbs in hardware stores or Home Depot anymore. They seem to carry only 40W bulbs, which use more power than I need. I was happy to find these 25W bulbs on eLightBulbs, and at a good price. They were well packed and arrived in perfect condition.
3/24/15 (Antioch, IL)
My exact light bulb was not available, so the customer service representative suggested this one. It fit and is working great. Thanks!!!
11/14/14 (Crestview, FL)
Good bulbs, put out good light at reduced wattage. Lights up garage and kitchen very well.
11/01/14 (Aurora, CO)
was so happy to find these on your site...they are no longer available in local stores or electrical supply stores...delivery was on time and they work like a charm...
5/12/13 (Reno, TX)
The first shipment was damaged on arrival and your customer service rep said to accept and destroy. Second shipment arrived in good shape and was enstalled in a ceiling fixture in our kitchen. Everything is working fine. Thank you.