Certain fixtures are rated for insulation contact. I'd be nervous to cover one in spray foam since its flammable. I suppose the 'fireblock' stuff might be fine. Hopefully S-F will chime in again on the fire safety aspect. The holes in can lights are to allow the heat to get out and the boxes that CFLs come in say that they shouldn't be in a sealed can fixture. I've seen plenty of youtube videos where they surround these with drywall(fire rated material) and then spray foam around that. I've also seen others where they just make a rigid foam box around it, probably not to code but if there is enough space it would be fine for a CFL. If these were in the attic and you were blowing in cellulose then you'll have a chance to cover a drywall enclosure too.
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