10M = 100 lights/ 20M = 200 lights/ 30M= 300 lights. 40M= 400 Lights, 50M=500 Lights, plus8M from Plug to the 1st Bulb. Light String Length: 10M = 100 lights/ 20M = 200 lights/ 30M= 300 lights. 40M= 400 Lights, 50M=500 Lights.
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