GE 39978 Starcoat Tube Bulb Watts 40 F21W/840 841

( Brand: Ge ), ( Part Type: Tube Bulb Case ), ( Unit Type: Unit ), ( Manufacturer Part Number: 39978 ), ( Country/region Of Manufacture: Hungary ), ( Unit Quantity: 40 )

Review GE Case Lot Of 40 F21w/840 841 Starcoat Tube Bulb Watts

The GE 39978 40 F21W/840 841 Starcoat tube bulb is a high-performance lighting solution designed for commercial and industrial applications. This bulb is a part of GE's Starcoat series, which is known for its exceptional durability and long life.

This 21-watt bulb is available in a 40-watt equivalent and is designed to provide an impressive amount of light output. It utilizes an advanced glass envelope that is coated with a special Starcoat material, which helps to improve light transmission and enhance bulb performance. This coating also provides an added layer of protection against shock and vibration, ensuring that the bulb can perform reliably in even the most demanding environments.

One of the standout features of this bulb is its long life. With a rated life of up to 24,000 hours, this bulb offers significant energy savings and reduced maintenance costs compared to traditional incandescent bulbs. The bulb's long life is achieved through the use of a robust filament design and advanced materials that are resistant to burnout.

The GE 39978 40 F21W/840 841 Starcoat tube bulb is also designed to provide excellent color consistency and uniformity. It produces a bright, clear light that is free from flicker and glare, making it an ideal choice for applications where consistent lighting is essential. The bulb also meets or exceeds Energy Star requirements, ensuring that it is an energy-efficient and eco-friendly lighting solution.

In terms of compatibility, this bulb is designed to fit most standard 840 or 841 base socket applications. It is also compatible with most automatic ballast systems, making it a versatile and flexible lighting solution for a wide range of commercial and industrial applications. Overall, the GE 39978 40 F21W/840 841 Starcoat tube bulb is a high-performance, long-lasting, and energy-efficient lighting solution that is perfect for businesses and organizations looking to upgrade their lighting systems.

The GE 39978 40 F21W/840 841 Starcoat tube bulb is a 21-watt, fluorescent bulb designed for use in commercial and industrial settings. Like all bulbs, it has its advantages and disadvantages.

1. Energy-efficient: Fluorescent bulbs, including the Starcoat tube bulb, consume less energy compared to incandescent bulbs.

2. Longer lifespan: The Starcoat tube bulb has a longer lifespan than incandescent bulbs, reducing the frequency of bulb replacement.

3. Instant lighting: Unlike incandescent bulbs, fluorescent bulbs provide instant lighting upon being turned on.

4. Starcoat coating: The Starcoat coating on this bulb offers improved light output and color rendering, making it suitable for use in areas where good color representation is essential.

1. Contains mercury: Fluorescent bulbs contain mercury, making them more difficult and costly to dispose of compared to incandescent bulbs.

2. Flickering: Some users have reported occasional flickering with this bulb, which can be distracting and may require replacement or repositioning.

3. Sensitivity to temperature: Fluorescent bulbs can be sensitive to temperature, and performance may be affected in extremely hot or cold environments.

4. Dimming compatibility: While some dimmers can be used with fluorescent bulbs, compatibility may vary, and the Starcoat tube bulb may not work optimally with all dimmers.

The GE 39978 40 F21W/840 841 Starcoat tube bulb is a reliable, energy-efficient option for commercial and industrial lighting applications. Its longer lifespan, instant lighting, and improved color rendering make it a popular choice. However, its use of mercury and potential for flickering, temperature sensitivity, and dimming compatibility issues are drawbacks that must be considered.

If you are in the market for a 21-watt, fluorescent bulb for commercial or industrial use, the GE 39978 40 F21W/840 841 Starcoat tube bulb is a solid choice, offering good performance and energy efficiency. Consider the application requirements, such as temperature conditions and dimming compatibility, to determine if this bulb is the best fit for your needs. If flickering is a concern, you may want to consider other brands or models with improved stability in this regard.

Details:

Open box lot of 40.

part #: 39978 prices

• $19.80-$67.95

specifications bulbbuffoon:

• brand: Ge
• part type: Tube Bulb Case
• unit type: Unit
• manufacturer part number: 39978
• country/region of manufacture: Hungary
• unit quantity: 40

seller bulbbuffoon:

• rating: 99.0%
• city: EuGene, Oregon
• # reviews: 395

returns bulbbuffoon:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller
• method: Money back

offer bulbbuffoon:

• options: Ship-to-home
• sold: 0
• quantity: 2
• availability: In Stock
• started: June 16, 2025

payments bulbbuffoon:

• other
• wallet: Apple-pay
• credit card: Diners-club

shipping bulbbuffoon:

• transit: 4-10 Days
• service: USPS Ground AdvantaGe
• class: Standard
• carrier: USPS
• cost: $25.55
• type: Calculated

General bulbbuffoon:

• condition: New Open box
• Facility Maintenance Safety > Facility Lighting > Light Bulbs Lamps

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