New update:
The veg stage will end soon. seems plants cannot wait to go into flowering stage. I dim the light to 190W with a lot of effort.
Now, it is the time to change it into 230W for flowering. I bought an extension cord from Mars rep to put the driver out of my tent.
Then the temp went down a lot. The heat problem could be solved in this way.
Anyway, i still like the light performance so far. ;)