A: Yes, the three-way feature of the lamp will not work, but the light bulb will work just fine.
A: Yes you can. The bulb will light on the second selection on a 3 way switch. So if the lamp is off and you turn the switch one time the bulb will not light till you turn the switch one more time. I use this bulb in 5 three way lamps myself.
A: I have one in a 3-way lamp. It works fine although you only have one light setting, not three.
A: No it cannot.
A: They are instant on instant 60 watt equivalent ligh in my unheated garage where the temperature gets down during the winter to the upper twenties/lower thirties. I also have 6 outside entrance way lamps that have the bulbs in them too. Instant on. instant 60 watt equivalent light.
A: No difference
A: Standard LED bulb.
A: Yes, the light distribution pattern is very even, and is similar to a traditional frosted incandescent bulb.
A: Omni-directional- this is a great lamp and you will not be able to tell the difference from an incandescent, except in your electric bill.