No, it cannot be installed in a bathroom, near a shower.
No, it is not dimmable.
This is a trim only. Please refer to the first bullet point "For use with up to a 75-Watt BR30 / PAR30 lamp (not included)"
Yes, but I would advise against using it specifically above the shower.
Thank you for your recent inquiry with The Home Depot, Richard. This light is not available on HomeDepot.ca, however you can view similar lights here: https://www.homedepot.ca/en/home/categories/lighting-and-ceiling-fans/indoor-lighting/recessed-lighting.html#!p=0&q=*%3Arelevance%3Aattributeid14591%3A5%20in%20to%207%20in%3AcategoryPathHierarchy%3A3%2Fhd-classes%2Fl1-lighting%2Fl2-indoor-lighting%2Fcategory-recessedlighting We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
This product fits into a 6 inch recessed housing using clips that hook into the inner housing. Before installing, make sure to remove any socket plates or brackets so that the connection wire in the housing hangs down freely. insert the light bulb into this trim (the eyeball) and connect the wire coming from the housing. Now insert the trim into the housing paying attention to the mounting clips that may need to be adjusted so that they catch the mounting hooks inside the housing. Press the trim up into the housing/ceiling firmly. Fin.