Matter has mass.
The longer answer is there is a lot of jargon
and philosophical questions involved with the
definition of light and matter.
You may have heard about the mass – energy
equivalence developed by Albert Einstein .
E = m c 2
This equation is saying mass, m, multiplied
by the speed of light, c, squared is an
Please note that m in E = m c
2 is the mass of an object.
There are some deep physical questions associated
with your inquiry. Particularly how can we equate
light and mass? Can we show the results in an
experiment? A lot of progress was made in the 20th
century answering these questions in the field of
high energy particle physics.
I am going to leave you with a fundamental law
of physics and an experiment. Energy can
neither be created nor destroyed, it can just be
changed from one form to another. It is
possible for the mass of two objects to decrease
when collided because some energy is emitted in a
photon. Rest mass energy was changed into
electro-magnetic energy. Please see equations 8
and 9 of the source cited.
 Fernflores, Francisco, "The Equivalence of
Mass and Energy", The Stanford Encyclopedia of
Philosophy (Spring 2012 Edition), Edward N. Zalta
(ed.), link =
click here to read.