What the Bible says about Concealing Light
(From Forerunner Commentary)
"Lamp" (NKJ) or "candle" (KJV) means any portable light, as a lamp, candle, or lantern. Jesus shows the disciples that He had enlightened them so that others might also see the light and benefit from it. When a person lights a lamp, he does not conceal the light but places it where it may be of use. So it is with God's way of life and those who follow it. God gives His truth to us to benefit others. It should not be concealed but show itself in stark contrast to the wicked world, thereby exposing and instructing it. If a light is concealed, as under a basket, no one benefits from it. However, considerate people place a lamp so that its benefits reach all who are in the house.
Martin G. Collins
Parable of the Light