sorry i was rushed and wanted to at least get the info out there. sorry about probably breaking forum rules. i actually rarely use that other site cause it is retarded, unlike this one :)
I ordered almost everything at factorymotion.com. the thermostat can be found here or on amazon . I already had the 30amp contactor, but they can be had for under $25 bucks.
R1 is your existing lighting relay. R2 is the over-temperature latch.
Everything functions as it currently does until the thermostat closes on high temperature. R2 will pull in, opening the contact in front of R1 and dropping it out, and simultaneously closing the R2 contact in series with the reset pushbutton. When the temperature cools to the point that the thermostat opens, R2 remains energized because of the current flow through the reset pushbutton and the now-closed contact. It will remain this way until the reset button is pushed or the power goes off.
i'll look for my order sheet form factorymotion to see what all i ordered. you could expand upon this by putting a timer into it so that you just feed your power straight into this device and then send the power to your lights