Just out of curiosity I checked a halogen bulb in our lab with a IR thermometer. It reached close to 300 F very quickly.
Great you have access to some things I do not. If you take an equal mixture of Coolant and water can you test to see what temp it takes to ignite? Per the sources I have read with it 50/50 it would take 700 degrees. I would love to have that answer.
Management is leery when I get too “Mad Scientist”... perhaps we should ping Mythbusters.