UDK 4.7.5 using blueprint to switch on light

Hello everyone smile
I have a problem about using blueprint to switch on a point light .
I CANNOT switch on the light .
I operate the blueprint based on the video on Youtube .

But my result is different from that of the video at 6:18

ps : my UDK version is 4.7.5 (be conpressed) (not conpress)

These are the forums for Unreal Engine 4, not UDK. Anyhow, just thought I’d let you know to refer to it as UE4 so as to avoid confusion, I also recommend that you upgrade UE4 to the latest version, which may fix any problems you have.