Strength and light weight are not so much in the choice of the wood as in the method of construction, so as to use as little material as possible.
Hollow core is one method, another is to build a frame with reinforcing across the middle, with a lightweight top panel (often plastics, or laminated from wood and plastic). Recall the construction of the paneled doors used in the early part of the 20th century, or a card table. These methods are still used to make lightweight tables for home use.