T9 Round Fluorescent Circline Lamp 40W 2700K - Soft White

In this review the Sunlite T9 Round Fluorescent Circline Lamp is examined for home and workspace lighting. The bottom line: this 40 watt, 2600 lumen circline lamp is best for anyone who needs bright, soft white illumination with low energy use and an easy swap into fixtures that accept a G10Q 4-pin base. The lamp's clear advantage is consistent, warm 2700K light at an efficient power draw, making it a practical choice where brightness and a comforting color temperature matter more than the longest possible lifetime.

Key Features

• Energy efficient: Consumes only 40 watts while delivering a high lumen output, helping reduce electricity costs for fixtures that use circline lamps.
• High output: Produces about 2600 lumens, providing bright, even illumination that improves visibility in rooms and work areas.
• Comfortable color: The 2700K soft white tone creates a warm, relaxing atmosphere suited to bedrooms and living spaces.
• G10Q 4-pin base: Designed for quick installation in compatible fixtures, simplifying replacement of existing circline lamps.
• RoHS compliant: Built to meet RoHS environmental guidelines, reducing hazardous substances in the product.
• Long rated life: Rated for an average of 10,000 hours, which lowers replacement frequency compared with short-lived bulbs.

Who It's For

This lamp is a good fit for homeowners, facility managers, and hobbyists who need bright, warm light from ceiling fixtures or dedicated circline housings that accept a G10Q 4-pin base. It works well in living rooms, bedrooms, kitchens, and office or utility areas where a soft white color and steady lumen output are desirable.

Those who require the absolute longest possible lifetime or want instant-on LED technology should consider other modern lamp types; likewise, it is not intended for fixtures that do not support a circline T9 form factor or the G10Q base.

Pros & Cons

Pros

• Bright 2600 lumen output provides strong, even lighting across rooms.
• Energy efficient at 40 watts, helping lower operating costs compared with older high-wattage fixtures.
• Warm 2700K color produces a comfortable soft white ambiance.
• Easy to install into fixtures that accept a G10Q 4-pin base.

Cons

• Rated life of 10,000 hours is good but some customers report mixed longevity in real use.

Specifications

Model type	T9 round fluorescent circline
Wattage	40 watts
Luminous flux	2600 lumens
Color temperature	2700K soft white
Base	G10Q 4-pin
Rated life	10,000 hours (average)
Dimensions	16 in D x 1.13 in H x 16 in W

Our Verdict

The Sunlite T9 Round Fluorescent Circline Lamp is a strong value for anyone replacing circline fixtures who wants bright, warm soft white light with good energy efficiency. It is especially useful where even room illumination and an easy G10Q installation are priorities; buyers wanting the longest possible lifespan or LED performance may prefer alternative lamp types.

Frequently Asked Questions

Will this lamp fit my existing circline fixture?
It fits fixtures that accept a T9 circline with a G10Q 4-pin base; confirm your fixture uses that base before purchasing.

How warm is the light?
The lamp produces a 2700K soft white color, which reads as warm and comforting in living areas and bedrooms.

How long will the lamp last?
It has an average rated life of 10,000 hours, though some users report mixed results with real-world longevity.