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Meaning of Fluorescent Bulb No.?
Old 07-18-2013, 12:46 PM   #1
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Meaning of Fluorescent Bulb No.?

One of the under-cabinet bulbs burned out. The markings on the bulb are F13T5/830/L . I get the impression the 13 might be watts, the T5 denotes the
smaller base.......don't know what the 830 and L are. If the replacement is
just designated F13T5 w/o the other numbers/letters, is it ok to use as replacement?
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Old 07-18-2013, 12:51 PM   #2
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Does this help?
https://en.wikipedia.org/wiki/Fluorescent-lamp_formats
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Old 07-18-2013, 01:17 PM   #3
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ah so, good find.....thanks. so T means tubular and 5 means 5/8" dia.......didn't exactly know that but assumed it meant something about the base size; 830 refers to color temp apparently, still don't know what the L is ?
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Old 07-18-2013, 04:00 PM   #4
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Quote:
Originally Posted by kaneohe View Post
ah so, good find.....thanks. so T means tubular and 5 means 5/8" dia.......didn't exactly know that but assumed it meant something about the base size; 830 refers to color temp apparently, still don't know what the L is ?
Guessing "L" is for lumens.
Color temp is more likely to be something like 2000-4000.
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Old 07-18-2013, 05:54 PM   #5
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Guessing "L" is for lumens.
Color temp is more likely to be something like 2000-4000.
The link above has a table with numbers that appear to be bins for color temps......the format will prob come out goofy but you can figure it out:
4 colums of data


Numeric color code/ Color/Approximate CRI/ Color temperature (K)
827 Warm white ~85 2700
835 White ~85 3500
841 Cool white ~85 4100
850 Sunlight ~85 5000
865 Cool daylight ~85 6500
880 Skywhite ~85 8000
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Old 07-18-2013, 07:46 PM   #6
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Originally Posted by kaneohe View Post
One of the under-cabinet bulbs burned out. The markings on the bulb are F13T5/830/L . I get the impression the 13 might be watts?
On all the fluorescent bulbs I've ever bought, the number after the F is the length in inches. The wattage is stamped elsewhere on the bulb.
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Old 07-18-2013, 08:00 PM   #7
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This one is 21" which seems to match some of those I google up .......for sure,
it's not 13". Were those the smaller T5's you're thinking of?
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Old 07-18-2013, 08:17 PM   #8
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This one is 21" which seems to match some of those I google up .......for sure,
it's not 13". Were those the smaller T5's you're thinking of?
About 5 inches in circumference = 5 / 3.14 ~ 1.6 inches in diameter
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