Unfortunately even tea is too caffeine intense for me so I've been sticking to decaffeinated coffee. A factoid, the color of a tea does not relate to its caffeine content.
You can also pull it like espresso and make great caffeine free lattes.
While it is not exclusively true, there is a pattern. You do have a general rule of thumb that black > green > white. These, of course, assume you follow the "proper" steeping times and water temperatures. Your caffeine content will vary with both these factors. The longer and hotter, the more caffeine.
If you want a low caffeine test I would take green or white tea and blanch it with hot water. Then make the tea. Or alternatively throw the first steep away and drink the second one.