As it is, the passage shows some resemblance with certain episodes from apocryphal and gnostic works, some of which we've already quoted before:
“Another time he took me and James and Peter to the mountain where he used to pray, and we saw him a light such that a man, who uses mortal speech, cannot describe what it was like. Again he took us three likewise up the mountain, saying, ‘Come with me.’ And again we went; and we saw him at a distance praying. Then I, since he loved me, went quietly up to him, as if he could not see, and stood looking at his hinder parts; and I saw him not dressed in clothes at all, but stripped of those we (usually) saw (upon him), and not like a man at all. (And I saw that) his feet were whiter than snow, so that the ground there was lit up by his feet; and that his head stretched up to heaven, so that I was afraid and cried out; and he, turning about, appeared as a small man and caught hold of my beard and pulled it and said to me, ‘John, do not be faithless, but believing, and not inquisitive.’”
Straightway, while I was contemplating these things, behold, the heavens opened and the whole creation which is below heaven shone, and the world was shaken. I was afraid, and behold I saw in the light a youth who stood by me. While I looked at him, he became like an old man. And he changed his likeness (again), becoming like a servant. There was not a plurality before me, but there was a likeness with multiple forms in the light, and the likenesses appeared through each other, and the likeness had three forms.
After he rose from the dead, his twelve disciples and seven women continued to be his followers, and went to Galilee onto the mountain called "Divination and Joy". When they gathered together and were perplexed about the underlying reality of the universe and the plan, and the holy providence, and the power of the authorities, and about everything the Savior is doing with them in the secret of the holy plan, the Savior appeared - not in his previous form, but in the invisible spirit. And his likeness resembles a great angel of light. But his resemblance I must not describe. No mortal flesh could endure it, but only pure, perfect flesh, like that which he taught us about on the mountain called "Of the Olives" in Galilee.
- The Sophia of Jesus Christ
When Philip had received these (words), and when he had read them, he went to Peter rejoicing with gladness. Then Peter gathered the others also. They went upon the mountain which is called "the (mount) olives," the place where they used to gather with the blessed Christ when he was in the body.
Then, when the apostles had come together, and had thrown themselves upon their knees, they prayed thus saying, "Father, Father, Father of the light, who possesses the incorruptions, hear us just as thou hast taken pleasure in thy holy child Jesus Christ. For he became for us an illuminator in the darkness. Yea hear us!"
And they prayed again another time, saying, "Son of life, Son of immortality, who is in the light, Son, Christ of immortality, our Redeemer, give us power, for they seek to kill us!"
Then a great light appeared so that the mountains shone from the sight of him who had appeared. And a voice called out to them saying, "Listen to my words that I may speak to you. Why are you asking me? I am Jesus Christ who am with you forever."
- The Letter of Peter to Philip
It came to pass then, when the disciples were sitting together on the Mount of Olives, speaking of these words and rejoicing in great joy, and exulting exceedingly and saying one to another: "Blessed are we before all men who are on the earth, because the Saviour hath revealed this unto us, and we have received the Fulness and the total completion,"—they said this to one another, while Jesus sat a little removed from them.
And it came to pass then, on the fifteenth day of the moon in the month Tybi, which is the day on which the moon is full, on that day then, when the sun had come forth in his going, that there came forth behind him a great light-power shining most exceedingly, and there was no measure to the light conjoined with it. ...] And that light-power came down over Jesus and surrounded him entirely, while he was seated removed from his disciples, and he had shone most exceedingly, and there was no measure for the light which was on him.
And the disciples had not seen Jesus because of the great light in which he was, or which was about him; for their eyes were darkened because of the great light in which he was. But they saw only the light, which shot forth many light-rays. ...] —And when the disciples saw that light, they fell into great fear and great agitation.
But the disciples sat together in fear and were in exceedingly great agitation and were afraid because of the great earthquake which took place, and they wept together, saying: "What will then be? Peradventure the Saviour will destroy all regions?" Thus saying, they wept together.
While they then said this and wept together, then, on the ninth hour of the morrow, the heavens opened, and they saw Jesus descend, shining most exceedingly, and there was no measure for his light in which he was. For he shone more [radiantly] than at the hour when he had ascended to the heavens, so that men in the world cannot describe the light which was on him ...] And it came to pass then, when the disciples saw this, that they feared exceedingly, and were in agitation. Then Jesus, the compassionate and tender-hearted, when he saw his disciples, that they were in great agitation, spake with them, saying: "Take courage. It is I, be not afraid."