Our take on the Light Bulb White

This is a 40-watt T5 circline fluorescent lamp: a ring-shaped tube with a 4-pin 2GX13 base, 4100K cool white light and a CRI of 82. It is a replacement lamp for fixtures built around the circline format, such as round ceiling and vanity lights. Compared with LED ring replacements, it runs hotter, uses more power and cannot be dimmed unless the fixture and ballast allow it, but it matches the original ballast and color temperature of many older fixtures.

Best forReplacing a burned-out circline lamp in an existing fixtureCool white light for bathrooms and utility roomsOwners of fixtures with a 2GX13 4-pin socket

Pros

Direct replacement for 2GX13 4-pin circline fixtures
4100K cool white suits bathrooms and task areas
CRI of 82 renders colors reasonably well
Ring shape gives even, shadow-free light in round fixtures

Cons

Fluorescent tube contains mercury and needs proper disposal

Questions and answers

Will this fit my fixture?

It fits fixtures that take a T5 circline tube with a 2GX13 4-pin base. Check the old lamp's pin count and shape before ordering.

Does it need a ballast?

Yes. It runs on the ballast already in the fixture. It will not work wired directly to mains.

What color is the light?

4100K cool white, a neutral white that suits bathrooms, kitchens and utility spaces.

Can I replace it with an LED ring?

Often yes, with an LED circline that bypasses or matches the ballast. LED versions use less power and last longer.

How should I dispose of the old one?

Fluorescent lamps contain mercury. Take them to a local hazardous waste or recycling drop-off rather than household trash.

Where is the Light Bulb White cheapest?

At Lighting Design Store, for $21.20, as of our latest check.

Light Bulb White

Best price now

$21.20at Lighting Design StoreChecked Nov 8

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Price facts

Last seen at $21.20 at Lighting Design Store on Nov 8.

Our take on the Light Bulb White

Best forReplacing a burned-out circline lamp in an existing fixtureCool white light for bathrooms and utility roomsOwners of fixtures with a 2GX13 4-pin socket

Pros

Direct replacement for 2GX13 4-pin circline fixtures
4100K cool white suits bathrooms and task areas
CRI of 82 renders colors reasonably well
Ring shape gives even, shadow-free light in round fixtures

Cons

Fluorescent tube contains mercury and needs proper disposal

Light Bulb White prices at every store

Lighting Design StoreNew
In stockReturn policy
$21.20Checked Nov 8
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About the Light Bulb White

This is a 40-watt T5 Circline fluorescent light bulb in a 4100K cool white color. It has a 2GX13 4-pin base and a color rendering index (CRI) of 82.

Power: 40 W
Bulb type: T5 Circline fluorescent
Color temperature: 4100K cool white
CRI: 82
Base: 2GX13 (4-pin)
Height: 12.00
Length: 12.00
SKU: 769344

Questions and answers

Will this fit my fixture?: It fits fixtures that take a T5 circline tube with a 2GX13 4-pin base. Check the old lamp's pin count and shape before ordering.
Does it need a ballast?: Yes. It runs on the ballast already in the fixture. It will not work wired directly to mains.
What color is the light?: 4100K cool white, a neutral white that suits bathrooms, kitchens and utility spaces.
Can I replace it with an LED ring?: Often yes, with an LED circline that bypasses or matches the ballast. LED versions use less power and last longer.
How should I dispose of the old one?: Fluorescent lamps contain mercury. Take them to a local hazardous waste or recycling drop-off rather than household trash.
Where is the Light Bulb White cheapest?: At Lighting Design Store, for $21.20, as of our latest check.