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No, do NOT add another extension cord... you've got everything right up to this point. The remaining open wire at your light needs to connect to the open terminal on the thermostat. If your wire on your light is long enough, you can connect it directly to the open terminal on the thermostat without using additional wire or wire nuts. Also, another note, keeping these thermostats close to your heat source(light) will help reduce the temperature fluctuations. Here's a quick drawing of how it should wire up.
No, do NOT add another extension cord... you've got everything right up to this point. The remaining open wire at your light needs to connect to the open terminal on the thermostat. If your wire on your light is long enough, you can connect it directly to the open terminal on the thermostat without using additional wire or wire nuts. Also, another note, keeping these thermostats close to your heat source(light) will help reduce the temperature fluctuations. Here's a quick drawing of how it should wire up.

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