Yes. Melkor and Ungoliant did not want to simply bask in the light and be near its beauty; they wanted to be the ones to own and control it. Out of greed and the lust for power, they were compelled to seek out the Silmarils. The simple action of sending light to "stay Melkor's hand" would perhaps frighten him, but not stop him -- I assume you are talking about the creation of the Sun and the Moon here? In this case, Melkor was definitely shocked by their creation, but it also served to infuriate him. He hated the fact that the Valar could control the light and he could not.
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