On Fri, 18 Nov 2016 12:56:51 -0800 (PST), wrote:

Hi,

I'm installing a recessed light in my soon-to-be enclosed boiler room. The boiler room will have 5/8" thick fire rated drywall ceiling and walls. Here's my question:
Do I need a special fire-rated recessed light can?
Do I need to make a 5/8" drywall box all around the light, in between the ceiling joists?
Or do I just use any standard recessed light can and move along with my work?
What is the right thing to do?

Thanks,
Theodore

The ceiling can lights would be my choice. Keeping any heat from
possibly causing a fire in the space above, in case something goes
wrong in the light. YMMV.

https://www.sparksdirect.co.uk/lights/ceiling-lights/fire-protection-ceiling-lights