Tanning and not really getting tan?

I DO NOT WANT LECTURES ABOUT HOW TANNING BEDS CAN KILL YOU.
I plan on doing it until october before my senior pictures, and then I'm done.

But, I've been going for 3 weeks now, 3 times a week. I've got like olive skin tone, and I am used to tanning really easy outside. But I haven't gotten really that much darker. Does lotion really make a difference? I've used this California Tan Ganja Accelerator a couple times and it does help but what is a lotion that will make me super dark??

I hear Swedish Beauty and Designer Skin are good, and no tinglers or anything hot please :)