Christmas Light Acronyms
It seems like acronyms are becoming more and more prevalent in our society, and the world of Christmas lights is no exception. So here is a quick guide to the acronyms you might come across while dealing with Christmas lights.
LED: Light Emitting Diode. LED lights last longer and use less power than comparable traditional Christmas lights.
C7 and C9: Denotations of bulb sizes. C stands for “candle” which describes the shape of the light’s “flame-like” appearance, and the numeral represents the number of eighths of an inch in diameter of each bulb. (For example, a C7 bulb is 7/8 inch wide, while a C9 is 1 1/8 of an inch in diameter.)
GFCI: Ground Fault Circuit Interrupter. This type of circuit-breaker is recommended on the electrical outlet you use for your lights. It can sense small imbalances in an electrical circuit and quickly shut off the electricity to the lights to minimize the chances of electrical accidents when a problem occurs.
UL: Underwriters Laboratories. This organization is responsible for setting industry standards for the quality and safety of electrical products like Christmas lights. You should only use UL-approved lights for your home.


Some people enjoy putting up Christmas lights on their home and in their yard. They get to exercise their creativity a little bit, and it may help them get into the holiday spirit.
Imagine this: it’s a Tuesday in December, and you arrive home from work to notice a few Christmas lights burned out on the roof of your house. You rummage around for a replacement bulb but fail to find one – or maybe you have to rush out to a Christmas show put on by your kids. Then you forget to buy spare bulbs on Wednesday when you’re forced to work late, you have to do some Christmas shopping on Thursday evening, and on Friday night your attendance is expected at the office Christmas party. Saturday is shot because of all the shopping and other holiday errands you have to run, so you have to give up watching football on Sunday just to get on the roof and replace those bulbs!
Do you have problems every year with your exterior Christmas lights shorting out? Have you ever found yourself dreading the moment that your turn into your driveway every evening – because you know you’re likely to discover another shorted-out strand of lights?