The Dendera light heat is what is capable of vaporizing Tokyo no the electric beam it emits.
Rider: "………Meri-Amen[1]."
It was a judgement sentence. As he lowered his right hand, he briefly just…… It wasn't the release of his Noble Phantasm's true name.
It had already ended the moment when they arrived at the great temple which was this great Pharaoh's image of a garden. So this was, as expected, judgement. "The Dendera Lightbulb" which showed the superior might of the gods that was equipped into the main temple――――had the same shine as when the US Navy Pacific Fleet's Aegis fleet there in the Yokosuka open seas vanished,
the scorching heat that came from mid-heaven, the rage of the sun which people cannot oppose, as it was
exchanged for the thunder of judgement done by rulers.
The mid-air cannon that was released by Ozymandias from the main temple, and the scorching heat of the sun that he was going to fire which was likened to the accumulated release of the Noble Phantasm here, they were also too intense. If he released it with all his might, it would probably have a sufficient quantity of heat that it could turn all the people in Tokyo into ash. Was it or was it not something which guided them into an abnormal situation called a "Reality Marble," which carried out intervention in the physical world, that force was too weird.
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It mentions heat a lot so, the Dendera have heat effects that is why it is too powerful and the heat can be emitted as sun light or all the heat can be converted into lightning for long range attacks which has heat as side effects. A noble phantasm power depends on its side effects and how it affects mystery and the physical world.