is this bulb made by Satco?

I bought 6 F8T5 halophosphor long tubes for little over $1.00 each.They are made by "CH LIGHTING" using the rare earth halophosphor powder on their line of products.They advertise it as of stable quality, reliable, long life span and energy saving (8 W) It has a 3000K degree color (closer to tungsten than fluorescent) which is comfortable to eyes. A day-light tube has close to 5000K or 6000K degrees which it will be hard on my eyes. I think they are good bulbs, I am using one only at this time. However, I have a problem: after 2 months the bulb doesn't start completely at the first start and flickers a bit. I decided to turn the bulb OFF and ON again and the bulb works just fine, pleasant color and I leave it on even in the day-light. You know, living in Seattle is so dark in the winter that we are moving like zombies and you need to have some light on most of the time. I am using also an old light appliance I found in the basement 25 years ago so I don't know if this bulb has a slight issue or my old appliance/starter has an issue being old. I will test another bulb next month. But I encourage you to buy it, the price is right and I am sure it is going to work. What I like is that it doesn't create electromagnetic fields interfering with my portable radios or phone.

How is the 12" measured?

It includes the prongs and measure 11 and 7/8's. Working well for under counter lighting.

what ballast do these bulbs require?

these bulbs are 12volt for rv fixtures

Bought a ge f8t5/cw and it is literally 1/4" longer than the one that blew. anyone know which brand would be shorter?

I was unable to use these as they did not fix my fixture also. The product I bought that works in my fixture is a Sylvania bulb made for my fixture. They are a little shorter but the main thing is at the end of each bulb is a rounded rectangle. When putting in the fixture you need to rotate them and they snap in. I had some problems trying to find what worked in my fixture. I ended up going to a lighting place in my area with a sample bulb and they took care of it immeadiately.

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(Pack Of 6) F8T5/CW - T5 Fluorescent 4100K Cool White - 8 Watt - 12" Super Long Life Light Bulbs

Product ID: 51290117

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Details

Brand
KOR
Light type
Fluorescent
Special feature
Energy
Wattage
8.00
Bulb shape size
T8

⏳20,000 hours super long life

⚡8W ultra-efficient power

🌡️4100K crisp cool white glow

Description

💡 Illuminate smarter, work brighter, live better.

COMPACT SLEEK DESIGN - 12-inch tubular shape fits seamlessly into modern fixtures for a clean look.
ECO FRIENDLY EFFICIENCY - High EU energy efficiency rating keeps your carbon footprint low while lighting up your space.
ENDURANCE THAT OUTLASTS - 20,000 hours of reliable lighting means fewer replacements and less hassle.
ENERGY SMART BRILLIANCE - Maximize productivity with just 8 watts of power—bright yet budget-friendly.
PERFECTLY BALANCED GLOW - 4100K cool white light enhances focus and creates a professional ambiance.

This pack of six KOR F8T5/CW T5 fluorescent bulbs delivers a crisp 4100K cool white light at an energy-efficient 8 watts. Each 12-inch tubular bulb boasts a super long lifespan of 20,000 hours, reducing replacements and maintenance. Ideal for professional environments, these bulbs combine sleek design with high luminous output (480 lumens) and a strong eco-friendly profile, making them a smart choice for millennial managers seeking sustainable yet powerful lighting solutions.

Specifications

Brand	KOR
Manufacturer	KOR
Package Dimensions	30.99 x 5.59 x 3.71 cm; 222 g
Item model number	No Model
Part Number	K25704
Number of Items	1
Colour	4100k (Cool-white)
Shape	Tubular(T)
Material	copper
Finish types	White
Voltage	120 Volts
Special features	Energy Efficient
Power and Plug Description:	Corded Electric
Batteries included?	No
Batteries Required?	No
Type of Bulb	Fluorescent
EU Energy Efficiency Label	High Efficiency
Luminous Flux	480 Lumen
Wattage	8.00
Wattage	8 Watts
Incandescent Equivalent	8 Watts
Colour Temperature	4100 Kelvin
Average Life	20000 Hours
Average Life	20000 Hours
Item Weight	222 g
Guaranteed software updates until	unknown

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