Decorative Lighting
noun
The 電 is what powers electric things. Many times, these electric things light up (especially back in the day, when electricity did this a lot more than other things). So, you have "lighting." Then, you have decorate. So, if you decorate with lighting, you have decorative lighting.
This is quite a specific word that is generally used as a product category for decorative lighting. It’s a less common word than other expressions, such as デコレーションライト or イルミネーションライト.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
あのトラックの電飾、すごくキラキラしててきれいだったよ！
The decorative lights on that truck were so sparkly and beautiful!
トーフグでは今、フグ型の電飾看板を作るプロジェクトが持ち上がっています。
A project in which they will make a fugu-shaped decorative lighting sign is now underway at Tofugu.
コウイチとビエトはクリスマスシーズン中、家の周りを電飾で飾って競い合います。
Koichi and Viet compete against each other by decorating with lights around their houses during the Christmas season.
省エネのために電飾にOAタップを使ってるって聞いたんだけど、タコ足配線にするのは危ないわよ。
I heard that you use power strips for decorative lighting to eliminate wasted energy, but you might overload the circuits so it's dangerous.