The answer to this question depends on the voltage and current capacity of your electrical outlet. Typically, a Christmas light strand requires a maximum of 120 volts of alternating current (AC) power to operate. Therefore, if you have an outlet that can provide at least 120 volts of AC power, you could theoretically connect an unlimited number of light strands to the outlet, as long as the total current demand does not exceed the outlet's current capacity. However, this is not recommended due to safety concerns.