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Lumens measure how much light you are getting from a bulb. More lumens means it's a brighter light; fewer lumens means it's a dimmer light.

Underwriters Laboratory, or UL, is one of the world’s largest and most respected consumer safety organizations. When you see the UL logo on lighting packaging it means that that product has undergone extensive testing to ensure that it is safe to use by the consumer.

Color temperature refers to the color of light. It is a crucial factor in designing any lighting system or setup. When speaking of color temperature you should be familiar with ‘warm colors’ and ‘cool colors’. Warm colors are those colors on the lower end of the color temperature spectrum, ranging from 2,700K to 3,000K. Yellowish light, the temperature of your typical incandescent bulb belongs to the warm color range. The ‘cool colors’ actually have the highest color temperature, ranging from 5,000K and up. The cool colored bulbs are usually white or bluish white, daylight is found in this color temperature...

The answer is sometimes. Sometimes an E26 base will fit into an E27 socket, while other times an E26 base will have one extra tread, preventing it from reaching the bottom of the socket and forming a connection.

What is the difference between the following three bulbs P-VIP 120-132/1.0 P22h P-VIP 120-132/1.0 E22HA P-VIP 120-132/1.0 E19 P stands for parabolic reflector. E is for elliptical reflector. The 19 and 22 denote sizes.