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Product Overview:
  • 34 inches long
  • High color rendering
  • Up to 20,000 hr life
  • Learn More

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21 Watt - Fluorescent Light Bulb - Linear - T5 - 82 CRI

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21 Watt - Fluorescent Light Bulb - Linear - T5 - 82 CRI

Item #F21T5
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About our 21 Watt - Fluorescent Light Bulb - Linear - T5 - 82 CRI

    These 21-watt T5 fluorescent light bulbs, available in three color temperatures, have a rated life between 10,000 and 20,000 hours.

  • 3 Models:

    Warm White
    Cool White
    21 watts F21T5-830 F21T5-841 F21T5-864
  • Diameter: 5/8in (0.625in)
  • Nominal Length: 34 inches long (Nominal Length for linear fluorescent light bulbs includes the length of the lamp and pins plus "the proper allowance for standard lamp sockets".)
  • Bipin Bases: bipin base at both ends
  • Color Temperature: color temperature varies with the lamp (light bulb) selected. 3000K is warm white, 4100K is cool white, 6400K is daylight
  • Very Good Color Rendering Index: 82 CRI
  • Very Good Rated Life: 10,000-20,000 hours of rated life on average depending on the lamp
  • Large Quantity Discount: If you would like us to quote on a large quantity of 21-watt T5 Fluorescent Light Bulbs, please call us at our toll-free number or use the online Quotation Request for Large Quantities form. We are always happy to provide you with our best large quantity pricing.

    Satisfaction Guarantee

Product Reviews
21 Watt - Fluorescent Light Bulb - Linear - T5 - 82 CRI
Questions & Answers
By Jay from Albuquerque, NM on January 20, 2015
Is it possible to find the exact measured length for this product from pin to pin? The only reason I ask is my display cases will only fit a bulb measuring 32.5". I have tried 34" bulbs. I have not had one fit yet. The Display cases were manufactured in China. I have about 10 cases in my store.
By Jacob from Pegasus Lighting on January 20, 2015

33-15/16 inches from pin to pin. This lamp will not fit in your display case lights.

By Joan L from Brooklyn, NY on April 22, 2015
We have T5 fluorescent fixtures that were from slim fluorescent (Savio lighting). Will the T5 bulbs you have fit them? We have 21W and 35W fixtures. The specs for the 35W on Savio give 57-5/8" length and for the 21W it is given as 34". My measurement of a 35W bulb we have looks as though it is 57.5 in including the pins.

By Jacob from Pegasus Lighting on April 23, 2015

Yes, these T5 light bulbs will fit.

By Marie Kochaver from Richmond, CA on November 23, 2013
Does this need a starter or separate ballast?
By Jacob from Pegasus Lighting on November 24, 2013

Yes, this T5 fluorescent light bulb requires a ballast.

By Shauna from Chester Springs, PA on January 21, 2013
Will this fit a Westek Portable Cabinet light Model# FA435HBL 120VAC 60HZ 21 W?
By Jacob from Pegasus Lighting on January 21, 2013


The specifications I found online indicate your fixture is about 34.5 inches long. This light bulb is the right length and wattage. I would assume that the fixture uses T5 fluorescent light bulbs, but to be safe, if you have the old light bulb, simply measure the diameter. If it's about 5/8 of an inch, then this light bulb will fit.

By CJ from SC on October 15, 2012
Will this fit the utilitech 34" fixture from Lowes?
By Jacob from Pegasus Lighting on October 15, 2012

Yes, I think these light bulbs should work just fine in that fixture.

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