K8064 difference

Hi. I have bought 2 K8064 dimmer kits and one works fine with 650W lamp while the other would not work with such a lamp. this other one works with normal 25W lamp but when connected to 650W lamp, it would just try to lid it up and then it would get into the error state (4 time red light blinks)

Could you please suggest something to me how to resolve this problem. It is a bit urgent for me since I would like to use this dimmer for my art work which has to be in place tomorrow :frowning:

Thanks for your understanding and help.

Kind regards,

Vania