whats the difference between cool light, warm light and daylight????

Warm white and soft white will produce a yellow hue, close to incandescents, while bulbs labeled as cool/bright white will produce a whiter light, closer to daylight and similar to what you see in retail stores. The three primary types of color temperature for light bulbs are: Soft/warm White (2700K – 3000K), Cool/Bright White (3500K – 4100K), and Daylight (5000K – 6500K). The higher the Degrees Kelvin, the whiter the color temperature. Typically, most people prefer Warm White (WW = 3000K) bulbs for their homes.

are 20 inch led fluorescent light tubes made?

I'm not aware of a 20" bulb and a quick internet search didn't reveal any. I've found measurements misleading to an extent. You might measure your old bulb. It might actually be a 21" bulb. It seems to me that the pins are often included in, or at least partially included, in the total measurement.

Yes they are very slim. I purchased them for an under cabinet/over counter light fixture.

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KOR F13T5/CW T5 Fluorescent Tubes, 13W, 4100K Cool White, 6-Pack

KOR F13T5/CW T5 Fluorescent Tubes, 13W, 4100K Cool White, 6-Pack

Product ID: 12863515

Details

Brand
KOR
Bulb Shape Size
T5 1/2
Light Type
Fluorescent
Special Feature
Energy
Wattage
13 watts

⏳15,000 hours long-lasting life

⚡energy-efficient 13W power

💡900 lumens bright output

254.68 DT

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Description

💡 Light up your life with brilliance that lasts!

ULTRA EFFICIENT POWER USE - Consumes only 13 watts while producing bright 900 lumens, saving energy without sacrificing brightness.
BUILT TO LAST 15 000 HOURS - Say goodbye to frequent bulb changes with a lifespan that keeps your workspace illuminated for years.
VERSATILE 6 PACK CONVENIENCE - Ideal for under-cabinet, under-counter, and RV lighting—upgrade multiple spaces with one purchase.
CRYSTAL CLEAR COOL WHITE GLOW - 4100K color temp delivers eye-friendly, professional lighting perfect for kitchens and offices.
EFFORTLESS TWIST LOCK INSTALLATION - 2-pin design makes setup a breeze—just push, twist, and light up your space instantly.

The KOR F13T5/CW T5 Fluorescent Tubes offer a powerful 900 lumens output with an energy-efficient 13W consumption. Featuring a crisp 4100K cool white color temperature, these 21-inch tubes provide eye-friendly illumination ideal for kitchens, offices, and RVs. With an impressive 15,000-hour lifespan and easy twist-lock installation, this 6-pack ensures long-lasting, hassle-free lighting upgrades for multiple spaces.

Specifications

ASIN	B00TJ6XL3Y
Additional Features	Energy Efficient
Best Sellers Rank	#10,594 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #32 in Fluorescent Tubes #1,465 in LED Bulbs
Brand Name	KOR
Bulb Base	G13
Bulb Shape Size	T5 1/2
Color	Cool White (4100k)
Color Rendering Index	900
Color Temperature	6500 Kelvin
Connectivity Technology	Normal bulb
Control Method	App
Controller Type	Push Button
Customer Reviews	4.5 4.5 out of 5 stars (1,911)
Incandescent Equivalent Wattage	13 watts
Indoor Outdoor Usage	Indoor
Item Weight	12.8 ounces
Light Color	Warm White
Light Output Maximum	900 lumens
Light Source Operating Life	15000 hours
Light Source Type	Fluorescent
Light Source Wattage	13 watts
Light Type	Fluorescent
Manufacturer	KOR
Manufacturer Part Number	K25674
Material Type	Glass
Model Name	Generic
Model Number	Generic
Number of Items	12
Package Quantity	1
Power Consumption	13 watts
Shape	Tubular(T)
Specific Uses For Product	Chandelier
Style Name	Classic
UPC	817300020528
Unit Count	6 Count
Voltage	130 volts
Wattage	13 watts
White Brightness	900 lumens

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254.68 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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