The potential energy is represented by the
ballast material. When the ballast bag is suspended, the
potential energy in the ballast is converted by gravity
with a slow descent of the bag. The converted energy
then generates light. The gravity light can be operated for
30 minutes continuously before the ballast bag needs to
be refilled. The strength of the light can be adjusted from
strong lighting to long-lasting low-level lighting. The
two terminals present at the front of the gravity light can
be used as a generator.