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21 Watt, 34 Inch T5 Cool White Fluorescent Bulb

SKU: 230839 | Ordering Code: F21T5/841/ALTO

In Stock
Price per Bulb
1 to 19 $12.99 Each
20 to 39 $11.99 Each
40 + $10.99 Each
Bulbs per Case
40
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Product Details

Brand

Philips

Energy Used

A rating, expressed in watts, to indicate the rate at which a lamp consumes energy. Also known as wattage value.
 
Energy Used
21 Watts

Bulb Shape

The description of the general appearance of a lamp/bulb consists of a letter(s) followed by a number. The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch. For example, a common household bulb is the A-19. The bulb is "A" shape and the diameter would be nineteen 8ths of an inch, or 2 3/8".
 
Bulb Shape
T-5

Base

The end (or ends) of the lamp that fits into the socket.
 
Base
Miniature Bipin

Diameter (in)

Light bulbs: a measurement of a bulb's width taken at the widest point of the bulb. Fixtures: the measurement across the widest point of a circular fixture.
 
Diameter (in)
0.625

Length (in)

Also referred to as "Maximum Overall Length" (MOL). For light bulbs, it measures the length of a light bulb, from the top of the bulb to the bottom of the base or pins and is typically expressed in inches. For light fixtures and ballasts, it applies to the total horizontal length of the item.
 
Length (in)
34

Average Rated Life (hr)

A measurement of the average length of time, between first use and the point when 50% of the lamps tested have stopped functioning, , using an operating cycle of 3 hours on, 20 minutes off.
 
Average Rated Life (hr)
25000

Brightness (Lumens)

A rating of the inital light output of a bulb, rated after 100 hrs of operation. Lumens are a measure of how much light falls on one square foot of area, one foot away from the light source.
 
Brightness (Lumens)
2100

CRI

Color Rendering Index is an international system used to rate a lamp's ability to render object colors. The higher the CRI (based upon a 0-100 scale) the richer and more accurately colors generally appear. CRI differences among lamps are not usually visible to the eye unless the difference is more than 3-5 points.
 
CRI
85

Color Temperature (Kelvin)

An expression of the hue of the light emitted, measured in degrees Kelvin. Usually expressed by a four digit number followed by (k), such as 2700k. Higher temperatures indicate whiter, "cooler" colors, while lower temperatures indicate yellower, "warmer" colors. Some common Kelvin temperature benchmarks are 2700k (warm white), 3500k (neutral white), 4100k (cool white), 5000k (bright white), and 6500k (daylight).
 
Color Temperature (Kelvin)
4100K

GE

A General Electric brand-specific product number for an equivalent item and is provided for the purpose of cross-referencing.
 
GE
39978 - F21W/T5/841

Osram Sylvania

An Osram Sylvania brand-specific product number for an equivalent item and is provided for the purpose of cross-referencing.
 
Osram Sylvania
20835 - FP21/841

Bulb Technology

The technology implemented by the bulb, e.g. incandescent, halogen, LED
 
Bulb Technology
Fluorescent

Bulb Finish

The surface finish of a bulb, which may affect the quality of the light emitted.
 
Bulb Finish
Opaque

Bulb Color

The color of the light produced by a bulb
 
Bulb Color
Cool White
Description
 
Reviews
 
Q & A

Philips SILHOUETTE™ brand energy saving T5 fluorescent lamp.  21 Watts and 34 inches to fit shorter commercial fixture lengths.

  • Cool white color is very popular for most businesses

  • T5 technology last longer than traditional T12, with greater lumen maintenance over time.

  • Performance - brand name product at a competitive price

REVIEW SNAPSHOT®

by PowerReviews
Philips21 Watt, 34 Inch T5 Cool White Fluorescent Bulb
 
5.0

(based on 2 reviews)

Reviewed by 2 customers

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Displaying reviews 1-2

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5.0

perfect bulbs for under kitchen cabinets

By Tunnelman

From Emery, MI

About Me Quality Oriented, Value Oriented

Verified Buyer

Pros

  • Available From Bulbscom
  • Bright
  • Long Life
  • Reduces Energy Costs
  • Runs Cool

Cons

  • None

Best Uses

  • General Lighting
  • Kitchen

Comments about Philips 21 Watt, 34 Inch T5 Cool White Fluorescent Bulb:

Bought under these under cabinet fixtures from big box store. When bulbs burnt out go back there and they didn't have any bulbs. Bulbs.com had them with choice of cool white and warm white. Perfect replacement.

  • Primary use:
  • Personal
 
5.0

Very Pleased

By JoeB

From Bethlehem, CT

About Me Quality Oriented, Value Oriented

Verified Buyer

Pros

  • Bright
  • Reduces Energy Costs

Cons

    Best Uses

    • General Lighting

    Comments about Philips 21 Watt, 34 Inch T5 Cool White Fluorescent Bulb:

    Product replaces a home center bought fixture's lamps that burned out in less than 3 months. The home center did not carry the replacement lamps. Since the fixture is used a a permanently wired safety egress lighting fixture, lamp replacement was crucial. An internet search found bulbs.com and they had a better lamp than the original so I bought them. The light quality is far better than the original and I plan on bying more fixtures, throwing away the included lamps an replacing them with the bulbs.com devices.I'm very pleased with the lamps [...]

    • Primary use:
    • Business

    Displaying reviews 1-2

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