Unfortunately I have very limited memories of this show, but it’s most likely either from the late '80s or early '90s. It’s a live action show, not animated.
I remember a group of kids interacting with an alien, which I remember as a ball of light. The children had a telepathic connection between themselves, and also with the alien. There was also some evil organization (as always) that wanted to capture the alien.
I remember one episode where the children are building different platonic shapes for some purpose. When they build a pyramid and one is partially inside it they’re like “hey why aren’t you answering to me?” and they realize the pyramid shape is blocking their telepathy.
I think the pyramid was supposed to be used to capture the alien by some evil people.