LED Corn Bulb

• E26 LED bulb , E27 bulb, E39 bulb and E40 refer to the type of base for the LED bulb, in particular the screw-type base, which shows the size of the bulb socket and the fitting.To be more specific:

E stands for Edison screw base (the threaded part of the bulb).

Number represents diameter of the base in millimeters.

• As for reference for buying, here is a suggestion：E26 bulb (26 mm) is commonly used in North American standard fixtures, while lamp for e27 bulb(27 mm) is typical in Europe. E39 led bulb(39 mm) and E40 bulb(40 mm) are larger bases used for high-wattage industrial and commercial lighting, such as in street lamps or warehouses.

Please consider the details of your specific purchase based on your actual needs.

• Color rendering index definition is a measure of how accurately a light source displays the true color of an object compared to a natural light source, such as daylight.
• CRI is measured from 0 to 100, with higher CRI values indicating greater color accuracy.

Below is color rendering index chart:

1. CRI 90-100: Excellent color rendering index LED (used in art museums, high-end retail stores, etc.).
2. CRI 80-89: Good color rendering (commonly used in offices, homes, and so on).
3. CRI below 80: Low color accuracy (commonly used in industrial or outdoor lighting).

Higher CRI LEDs produce more vibrant and realistic colors and are therefore preferred in applications where color accuracy is important.

All of the LEDs provided have a color rendering index higher than 80.

Here is an article to show the replacement of old bulb: LED Lights Replacement: Replacing Light Fixtures with LED Corn Bulbs for Multi-Wattage Old Light

• UL certification (Underwriters Laboratories):

1. UL is a globally recognized safety certification mark, and it is particularly applicable to electrical products.
2. Importance: It ensures that a product meets specific safety requirements and effectively reduces the risk of fire, electric shock or other hazards.

• cUL (Canadian Underwriters Laboratories):

1. cUL is the Canadian equivalent of UL certification, always as underwriters laboratories lamp.
2. Importance: Ensures that products comply with Canadian safety regulations and provides relevant safety assurance for products used in the Canadian market.

• DLC (DesignLights Consortium):

1. DLC meaning: it is a certification that focuses on the energy efficiency and performance of commercial lighting products.
2. Purpose: DLC certification ensures that a product meets specific energy efficiency, quality and performance standards, typically for LED lighting.
3. Applications: Commercial lighting programs often use fixtures with relevant certifications.