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13 watt - 120 volt - Twist and Lock (GU24) Base - 5,000K - SpringLamp - Twist / Spiral
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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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Wherever you see this badge, you can be assured that the review has come from a customer who has purchased from eLightBulbs, ensuring the authenticity of the review.
12/07/13 (Lynnwood, WA)
Twist and lock bulbs are not easy to find in 5000k. I didn't even know this connection type existed until the purchase of my new home. I was pleased to find them here. I purchased 20+ and all items arrived on time, as described and nothing broken. The light output and quality are all consistent. I would purchase again.
9/06/13 (Jacksonville, TX)
I purchased 9 of TCP 13 watt 120 volt Twist and Lock Base 5000K CFL for our bathroom light fixtures. All seem to produce the same color and quality of light. I'm satisfied with my purchase and I would purchase again.
11/27/11 (Carolina, PR)
Nice little bulbs. I still think the color temperature could use some tweaking but after a few hours of "breakout" these bulbs are not uncomfortable to look at.
One thing I found odd is that I bought two of these 13-watt bulbs and two 18-watt bulbs, all from TCP and all 5000K color, yet the 13-watt bulbs are pretty much as bright as the 18-watt bulbs. Either the 13-watt bulbs are too bright or the 18-watt bulbs are not bright enough. I'm leaning towards the latter.
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