Model # 409748

Internet # 202504341

Store SKU # 209974

21 in. T5 13-Watt Cool White (4100K) Linear Fluorescent Light Bulb

$8.47 /each
(limit 35 per order)
  • Cool white lighting
  • Saves energy
  • Lasts up to three years

Frequently Bought Together

Product Overview

For effective residential and commercial lighting, select the Philips 13-Watt 21 in. T5 Cool White Linear Fluorescent Light Bulb. It produces cool, white light and can last up to three years. The T5 linear fluorescent bulb has a medium, bi-pin base. It is meant for indoor use.

  • Brightness: 820 lumens
  • Estimated yearly energy cost: $1.57
  • Life: 6.8 years (Based on three hours/day)
  • Light appearance: 4100K (cool white)
  • Energy used: 13 Watt
  • Lumens per watt: 63
  • Contain less mercury than standard fluorescent bulbs
  • For general use including indoor, commercial and residential use and ideal for home or office for versatility
  • Bi-pin
  • Contains mercury: yes (for more info on cleanup and safe disposal, visit: epa.gov/cfl)

Info & Guides

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Approximate Lightbulb Length 
Bulb Diameter (In.) 


Average Life (hours) 
Bulb Shape 
Bulb Type 
Commercial / Residential 
Commercial / Residential 
Light Bulb Base Code 
Light Bulb Base Type 
Light Bulb Features 
No additional features 
Light Bulb Shape Code 
Light Color 
Cool White 
Light Output (lumens) 
Lighting Technology 
Number in Package 
Watt Equivalence 
Wattage (watts) 

Warranty / Certifications

ENERGY STAR Certified 
Manufacturer Warranty 
Yes, 6.8 years. Please see package for details. 

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Customer Questions & Answers

1 Question3 Answers

Customer Questions & Answers

21 in. T5 13-Watt Cool White (4100K) Linear Fluorescent Light Bulb
21 in. T5 13-Watt Cool White (4100K) Linear Fluorescent Light Bulb

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3 answers

I have a Sylvania Cool White F13T5/CW light bulb. I measured it 20 1/2 inches. But this T5 13W 4100K is 21 inches. Are they different?

This question is from 21 in. T5 13-Watt Cool White (4100K) Linear Fluorescent Light Bulb
Asked by
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January 13, 2014
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Answers (3)

Asked by
Fort Worth, TX, USA
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Home Improvement Profile: DIYer
February 2, 2015
This bulb will work. The measurement including the prongs is 20 1/2" and just 20" without. Not sure why they say 21".
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Asked by
Forney, Tx
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August 5, 2014
I believe they are inter changeable.
2out of 2found this answer helpful.
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Asked by
Philips Lighting, North America HQ
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January 15, 2014
Hello and thank you for your question. Did you include the length of the bulb's pins? The standard length is 21 inches.
3out of 3found this answer helpful.
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Customer Reviews

Rated 3.7 out of 5 by 26 reviewers.
Rated 4.0 out of 5.0 by Ok Enough iluminación for the space used and last longer. July 19, 2016
Rated 5.0 out of 5.0 by Flurencent Lights Good bulb. Been in my house 16 years, this is only the second time I've replaced this bulb in all that time. March 29, 2016
Rated 5.0 out of 5.0 by Works Simple replacement for the burned out bulb. It works as it should! March 22, 2016
Rated 5.0 out of 5.0 by Best value! This has been my go-to bulb for years for lighting the garage. January 19, 2016
Rated 1.0 out of 5.0 by Could be manufactured for longer life These lights are short lived and costly. I am in process of re engineering the facility to accommodate a more efficient system. October 20, 2015
Rated 5.0 out of 5.0 by Great replacement bulb Needed to replace my desk light. Be sure to measure for appropriate length. September 21, 2015
Rated 1.0 out of 5.0 by Replacement bulbs for HD fixtures HD does not seem to carry the proper replacement bulbs for their fixtures for very long. Twice now I have had to either replace the fixture or go on-line as I did this time and buy bulbs that would fit the HD fixture from different suppliers. August 25, 2015
Rated 5.0 out of 5.0 by Linear Fluorescent Light Bulbs I have two lights that require the above mentioned bulbs in my kitchen. They were exactly what I was looking for as a replacement. A little pricey but all light bulbs are expensive now. August 11, 2015
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