Elwill has rightly described that it is a metaphor. Muhammad was not made from light. He was just a man like any other man except that he was chosen by Allah to be his messenger. He received revelation from God.
He himself said or was told to say to all people: " Say, I am a person (Bashar) like all of you. It has been revelaed to me that you God is One God…"
Of course he had the light, that was spiritual matter, not physical. He was a mortal man like any one else. Being a messenger makes him suprior to many people, just like all other prophets of God.
Light in Arabic is of two types. One is called Dhiaa. That si the inherent light which is a part of something. It is in the body. It belongs to that body. (Such as in the Sun.)
The other light is the borrowed light or light in transit. That is called Noor. That is a light which doe snot belong to the body. It is a granted light or reflected light. It is some kind of illuminated light, such as in the Moon.
The Quran, at various places, describes the two types of light clearly as Dhiaa or as Noor. It says that Sun has Dhiaa or inherent light. The moon has borrowed light called Noor. Please see just one example in chapter 10 verse 5.
"It is He (Allah) who has made the Sun wth Dhiaa (i.e. internal, inherent shining bright light) and the Moon with Noor (the borrowed light, cool, soft, pleasing light) and proposed (ordained) stages for them (Sun and the Moon) so that you may keep accounts of years etc…" 10:5.
According to above Muhammad has the light which is given to him by Allah. He has not the inherent light. But he has the light sent to him from Allah. It illuminates him spiritually… For such an illumination, one needs a very clear pious heart. Allah will not send his light on any dirty heart. That light lands on the most truthful heart which has no hatred or envy or enmity, on such aheart which has no falsehood.
That was Muhammad. But it is not only for Muhammad. It applies to all persons, Tom Dick and Harry, if they purify themselves and keep themselves away from maladies, hatred, bias etc, and away from any false thinking, that person will receive the words of God. I am sure of that. Even today, same is the rule for all mankind, man or woman, to purify themselves and see the miracles coming from God. They will recelive messages from god and the good news.