The reader replied:
In response to your opinion on previous email
These are the lights that I have purchased.
Clear 25 C7 Light Set
Item # 1088194
This indoor/outdoor set of clear lights makes a dazzling addition to your holiday décor! Old-fashioned shaped bulbs contain candelabra bases that resist corrosion. A sturdy plastic clip holds each light into place.
25 C7 clear lights included.
12" spacing between bulbs, 25' green wire total length (24ft. lighted length).
7.5" lead cord length, 7" tail cord length.
Connect up to 2 sets end-to-end!
1 fuse included.
Again, what is your opinion on this matter of mine?
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These draw a lot of power compared to modern LED lights that hardly draw any. When they say only to connect two sets, they're saying that the wires and plug are only capable of handling a certain amount of voltage. 25 5-watt bulbs makes 125 watts. Two plugged in series is 250 watts. Much more than that and you risk melting the insulation off the wires.
They're what I grew up with, and still one of my favorite configurations. But the only way to get more of these classic C-7 bulbs on your tree is to buy some more strands.
I'm sorry if that's not the answer you wanted, but I'd be a lot sorrier if you burnt down your house.