No, it is not possible to get an LED lamp that glows in the dark without any external source of light. LED lamps require an electrical current to pass through them in order to emit light. They do not possess any inherent luminescent properties that allow them to emit light in the absence of an energy source.
However, there are products available that incorporate glow-in-the-dark materials or phosphorescent coatings. These materials can absorb light energy from an external source, such as sunlight or artificial light, and store it. Once the external light source is removed, these materials gradually release the stored energy in the form of a dim glow. This effect is known as phosphorescence.
So, while you cannot achieve a self-illuminating LED lamp, you can find glow-in-the-dark products that can emit a faint glow after being exposed to light. These products are commonly used for decorative purposes, safety markings, or children's toys.