13 watt T4 4-Pin (G24q1) Base 3,000K 800 Series Ecologic Dulux D/E Compact Fluorescent Sylvania Light BulbSylvania CF13DD/E/830 20721
$5.07
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Our Part #:
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SL20721
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Manufacturer:
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Sylvania
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Manufacturer Code:
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CF13DD/E/830
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Case Size:
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50
($253.50/Case)
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For an explanation of a lighting term, click on the 
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Energy Used:
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13 watts
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"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.
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Average Lifetime:
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12,000 hours
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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.
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Bulb Type:
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T4
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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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4-Pin (G24q1)
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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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Color Temperature:
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3,000K
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This is the color of the light coming from the bulb.
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Correlated Color Temperature (CCT) is a specification of the color appearance of a lamp, 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.
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CRI:
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82
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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.
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Length:
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5.2 inches
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This is sometimes referred to as MOL, or "Maximum Overall Length". For light bulbs, 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. For light fixtures, it applies to the complete vertical length of the fixture, out of the package.
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