These light-bulbs are fairly limited in usage since there are so many restrictions in the notes - bottom line is not to severe or over-tighten the string. The actual light-bulbs are 3.25 inches in lengths, with a regular/standard light-bulb socket, and are 11 Watts each. They are regular incandescent bulbs, not LED. The string can hold bulbs up to 25 Watts. Some reviewers mentioned that these bulbs are quite bright - in my opinion they are rather dim. If I would change something I would have preferred that the strings/cables would not be as bulky - but that cold have increased the fire hazards.
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