Cooltube with temperature display and security switch

Hi, someone want to buy cooltube with temperature display and thermalswitch. If the temp in duct reach 75 celcius it cut the power to the ballast. Very safe for fire. Temp display is good to adjust your airflow with speed controller.

150$C for 8"

Silly idea and against shitty forum rules. Craigslist.

Why silly idea??