The passed 2 days my poo is a very very light green colour and it has hard dark green lumps in it?

Green stool color: Color of stool varies with foods, speed of emptying of the GI tract, medications & supplements ingested, gut flora (unique for each individual), additives (like blood), subtractions (like absent bile), infection, inflammation, & other factors. If the green color is unusual for you & persists despite stopping the vitamins in question, or is accompanied by other symptoms, see your doctor please.

No worries.: A light green stool is not abnormal. Sometimes the stool changes colors inexplicably and it does not signify anything abnormal. I would not worry about it. If you see bleeding or black stools, you need to have those evaluated immediately. Good luck.