The idea is to gain the positive effects of it without it making you high.

Around 10-20 is when people start noticing effects, being a small dose.

50, being half a dose, can feel very "muddy", as in, its kind of "half assed". You start to feel more high, but not as visual and enjoyable.

Normal dose would be the typical 100.

Although people's experiences of different dosages vary a lot. For some the sweetspot might be 70-100, for others it's 200-250.

Based on your description, it sounds like around half a dose, if you just sometimes get visual effects.