The main thing you should consider when choosing a Tiffany lamps is how you want it to light your room? Or you should ask yourself, are you buying the lamp for it's shear beauty... the exuisite work of art that will be the focal point of your room?
Are you looking for a stained glass lamp that creates a cool light that will sparkle on your furniture like the north star outshines a sea of stars on a pitch black sky.
Or you Tiffany lamp for your office that needs a bit of an umph? Or are you looking for a lamp to match or complement your existing furniture... or do you want to make afeature of your Tiffany lamp.
Asking yourself these types of questions will make the choosing of your Tiffany lamp easier.