The title says 4 inch 30w light but the discription says it is a lot biger than 4 inches. So which one is the correct one ?

Thank you for your question. I am sorry that we made it wrong, the correct dimensions is 5.8''x3.7''x2.5''

Can you please tell me the exact dimensions of the entire housing?

Its length, width and height are exact 22.83",14.57",9.84"

How many lumens does one pod out put?

the lumens is 3600lm each pods