Welcome O2x Ohio !
Regarding your interest in the Epicurean understanding of light, I can be of some help when it comes to the secondary literature. Well, primarily the secondary literature on Lucretius. The tradition of commentary on the school of Epicurus has been fraught since very near the beginning, which is why I would ordinarily echo Dewitt's exhortation to return to the texts! However, I think you may find this essay by Edward Neville Andrade (1887-1971) of University College, London to be of some interest. It was published as an introductory essay to the second volume of H. A. J. Munro's three volume text (I), commentary (II), and translation (III) of De Rerum Natura. The essay is titled The Scientific Significance of Lucretius, and, though the scientific perspective of the author is now a century and a half out of date, he is much more thorough than other sources we have. Einstein for example wrote a forward to a German translation of Lucretius, but it is no more than superficial regarding the actual ideas presented by the poet. That's why Andrade's essay is useful--he goes much deeper.
Here is the text at the Internet Archive. I hope you find it helpful.
And here is another interesting scientific appraisal of Epicureanism, this one in the form of a popular lecture by the Irish physicist John Tyndall--a lecture that caused great controversy when it was delivered in 1874.