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GE SG_B001MUTPKI_US F8T5/CW Fluorescent Tube Bulb

★★★★★4.1 (106 reviews)

This GE F8T5/CW tube delivers 400 lumens of 4,100K cool white output — reliable workhorse illumination for fixtures where color accuracy isn't mission-critical.

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Overview

The GE F8T5/CW is an 8-watt straight T5 fluorescent tube rated at 4,100K and 400 lumens — a compact, low-wattage light source designed for the specific physical constraint of T5 fluorescent fixtures where larger tube formats simply don't fit. The T5 designation (5/8-inch diameter) is a physical standard, not a performance tier, and the F8 prefix confirms the 8-watt power consumption. At 4,100K, the output falls in the cool white range — clean and neutral enough for task work, but without the daylight-spectrum rendering that higher color temperature sources provide. The CRI of 60 is the most significant limitation for any application beyond basic utility illumination: colors rendered under this tube will appear noticeably muted and shifted relative to their actual appearance under a high-CRI source.

This tube serves a specific replacement market: T5 fluorescent fixtures in older commercial, industrial, or appliance lighting applications where a compatible tube is needed and the performance limitations are acceptable given the application. Under-cabinet kitchen lighting, appliance interior lighting, display case illumination in non-color-critical retail, and supplemental task zones are appropriate environments. The 5,000-hour rated lifespan and GE's production quality deliver consistent output over that period without significant lumen depreciation variance. For applications where accurate color rendering matters — photography, video, art, or retail display of color-sensitive merchandise — this tube's CRI 60 rating disqualifies it, and a high-CRI LED alternative should be specified instead.

Key Features

Length: 12"

Specifications

Brand
GE
Model
F8T5/CW
ASIN
B001MUTPKI
Shape
Straight T5
Wattage
8W
Color Temperature
4,100K (Cool White)
Lumens
400
CRI
60
Average Lifespan
5,000 hours

Pros & Cons

👍 Pros

  • The T5 form factor fits compact fluorescent fixtures where larger T8 or T12 tubes physically cannot, making this tube the correct replacement for applications built around the 5/8-inch tube diameter standard.
  • The 4,100K cool white color temperature is appropriate for task and work surface lighting where a neutral-to-cool appearance improves visual acuity without the yellow cast of warm white alternatives.
  • At 8 watts, the power draw is low even by fluorescent standards, contributing minimal heat output in fixture designs that enclose the tube closely, where thermal management is a constraint.
  • Genuine GE manufacture provides consistent production tolerances for lumen output and color temperature relative to off-brand T5 alternatives that can vary significantly unit to unit.
  • The straight T5 tube form factor is a direct drop-in replacement for compatible fixtures without any rewiring or fixture modification.

👎 Cons

  • A CRI of 60 is substantially below the 80+ minimum threshold for accurate color rendering in inhabited spaces, meaning fabrics, skin tones, and colored objects will look noticeably undersaturated and shifted under this light.
  • The 5,000-hour average lifespan requires replacement roughly every 20 months at 8 hours per day use — approximately 3–5x shorter than comparable LED T5 replacement tube alternatives.
  • 400 lumens is a low-output source — it is insufficient as primary area illumination for any space larger than a small enclosed cabinet or under-shelf task zone.
  • The tube requires a ballast-equipped T5 fixture; it is not directly compatible with electronic LED driver T5 alternatives without fixture modification, limiting retrofit flexibility.
  • No dimming compatibility is specified for this tube, which restricts lighting control to on/off switching in fixtures without LED driver replacements.

Frequently Asked Questions

4,100K is a cool white color temperature, sitting between neutral white (3,500K) and daylight (5,000K–6,500K). Light at this temperature reads as clean and clinical rather than warm — appropriate for task lighting and general commercial illumination, but noticeably cool and flat relative to the tungsten and warm-white sources used in photography and cinema setups.
The CRI (Color Rendering Index) is 60. This is a low score — a CRI of 100 represents perfect color rendering relative to a reference source, and professional photography, video, and studio lighting standards typically require CRI 90 or above. A CRI of 60 means colors will appear noticeably desaturated and shifted, making this tube unsuitable for color-critical work like product photography, video shooting, or color grading environments.
T5 designates the tube diameter — 5/8 inch (5 eighths, hence "T5"). The F8 prefix indicates an 8-watt rated power draw. This tube requires a compatible T5 fluorescent fixture and ballast rated for 8-watt T5 operation. It is not interchangeable with T8 or T12 tubes due to different pin spacing and ballast requirements.
5,000 hours is a short lifespan by modern lighting standards — LED alternatives in similar form factors often carry 25,000–50,000-hour ratings. At 8 hours per day of operation, this tube requires replacement roughly every 20 months. For infrequently used fixtures, lifespan is less of a concern; for high-use commercial applications, the replacement cycle adds maintenance cost over LED alternatives.
The F8T5/CW produces 400 lumens. This is a low-output source appropriate for supplemental task lighting, small enclosed fixture applications, or accent functions — not a primary area light for rooms larger than approximately 20–30 square feet at desk height. Compare to standard T8 fluorescent tubes that typically produce 2,600–3,200 lumens.

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