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1) No, if insulation is placed over a can light, the light must be rated as "IC rated" type. The light bulb type does not matter.
2) If using a "non IC" rated can light, then there must be a minimum of a 3" (three inch) clearance from any insulation and the can light housing. Insulation cannot be placed over the top of a "non-IC" rated can light.
3) Keep in mind that can lights whether "IC" or "non IC" rated have been tested by a third party testing lab such as UL. If not adhering to the correct type of can lighting fixture or maintaining the minimal clearances, this will void the UL listing of the can light and can also present a potential fire hazard.
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