I just bought HS200 and HS220 thinking both are 50/60 Hz.  However, I realized that HS220 (dimmer) operates at 120v at 60 Hz.  Can I still use HS220 in Tokyo Japan safely?   I thought the frequency mattered the most for the motor (faster or slower) but as it has something to do with the light which creates heat, I wanted to make sure.  Thanks.