House Beautiful suggested that

Safety was an important factor and House Beautiful suggested that
consumers check for sets carrying the Underwriters’ Laboratories label
testifying to their fire-safeness. Rubber washers were recommended for
added safety. Clipping the lights to the branches was made easy by the
use of beads which slid along the wires, clips attached to the socket, and
even alligator clips used to keep bulbs upright (especially important when
using bubble lights).
Interestingly enough, our later mania for trees decorated in one color
had its roots in 1940s lighting. Americans striving for their own special
dramatic effects searched for some different ways to light their trees.
Design decorators suggested all white lamps for sparkle and crispness
while white and orange were suggested for mellow brilliance. All blue
lamps gave a soft, hushed appearance and all green lamps increased the
greenness of the tree. Red was discouraged as it would create a brown
tree. Muhi-colored lights were suggested for a bright, cheerful tree when
a particular effect was not desired. Other effects with lights were achieved
by bringing the light strings down in straight lines from the top. A bar-
ber+pole design was suggested for tall trees or even a lively candy-stick
pattern was proposed by inserting “pin-type” sockets at 6″ intervals along
the wires between the regular sockets. Floodlights were used with 150.
watt projector lamps with colored lenses. Reflectors behind the lamps
were promoted (probably in the interest of saving electricity in a time of
war-frugality), which not only added color, but also added increased light,
thereby possibly decreasing the number of bulbs required.

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