When trying to calculate how many lights are needed for trees, there are a few industry standards, as well as considerations that must be taken.
There is no exact calculation to determine how many lights are required to light outdoor trees. Slender and deciduous trees will require the least amount of lights for desired affect. Evergreen trees including Spruce, Pines and Firs that retain most of their foliage in the winter may require up to 25% more lights than the recommended count.
|Tree Height||Mini Lights||5mm LEDs||C7 Bulbs|
String length is a consideration when calculating how many lights are needed. 100 light count strings can come with various spacing between bulbs, resulting in string lengths that can differ by 15' or more.
The type of light string chosen makes a difference in light count. The most popular bulb sizes for trees are mini lights, 5mm wide angle LED bulbs, and C7 bulbs.
Every Christmas lighting project requires light calculations for power. Lights will burn brighter and last longer when the proper calculations are used to determine how many lights can be plugged together. The UL standard for how many lights can be connected has recently changed, allowing for up to 210 watts to be plugged together on a standard 22 gauge wire, and 410 watts on a commercial grade 20 gauge wire. C7 bulbs vary greatly depending in wire gauge used, which can be as thick as 18 gauge, allowing for up to 100 C7 bulbs to be connected.
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