Here are my Christmas light power measurements and estimated use for this year.
Back Yard Tree (I only did 5 strings on one tree this year):
6.79 A rms
6.5 Hours per day
5.3 KWH per day
Front decoration:
8.26 A rms
6.5 Hours per day
6.44 KWH per day
Living Room Tree:
2.88 A rms
7.5 Hours per day
2.59 KWH per day
Dining Room Tree:1.55 A rms
6 Hours per day
1.12 KWH per day
Front Room Tree: 1.41 A rms
6 Hours per day
1.02 KWH per day
AJ's Room Tree: 0.36 A rms
3 Hours per day
0.13 KWH per day
AR's Room Tree: 0.23 A rms
3 Hours per day
0.08 KWH per day
Rec Room Tree: 0.1 A rms
2 Hours per day
0.02 KWH per day
Total:
21.59 A rms peak
16.7 KWH per day average
At a cost of $0.10 per KWH, the total cost for the season is $41.75 for the 25 days this year the lights will be on.
The Rec Room tree was a new tree this year so I bought LED lights. It has about the same amount of lights as the dining room or front room tree for less than 1/10 the power. The LED lights are quite expensive though so replacing existing working lights may not make economic sense yet. One thing I've noticed about the LED lights this year is that the colored lights look almost too perfect and the colors are a little off of what you're used to in Christmas lights. Overall I like the colored lights though. The white lights though look very bad. They almost have a cold bluish color to them, instead of the warm yellowish color that incandescent white Christmas lights have. So the LED light manufacturers are going to have to work on improving the white lights.