Thompsons is fine but if you are planning to use a retrofit light that has a high heat output, ie metal halides, you will have to use a 1/2" spacer to mount the retrofit and fans blowing in* from the sides and few "grilles" on the top of the canopy to vent out the heat.
*if you use the fan to blow out, the moisture will shorten the life of the fan, especially in SW applications
HTH
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