The lamp which Jesus was probably most familiar with was the "Herodian" lamp, made on a potter's wheel of thin, light-brown clay.
When it was dark enough to light a lamp, you'd set it high enough to illuminate everything around --- on a shelf in the stone wall of your home or on a wooden lamp stand in the center of the room.
"No one lights a lamp and hides it in a jar or puts it under a bed.
Instead, he puts it on a stand, so that those who come in can see the light."
Jesus' words about not hiding it were funny. I picture Him smiling as He said it- If you're going to light a lamp, you do it for illumination, not to hide or conceal it. If that were your purpose, you wouldn't light it at all.
So, that little light of your's??? You're gonna let it shine.