More sunlight, no.

As has been pointed out before the Carboniferous was a different setting climatologically than the Mesozoic. Arthropods absorb oxygen through their exoskeleton and therefore large forms can only be supported in higher oxygen environments. The lack of these large arthropod forms indicates lower oxygen levels.

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(By the way, I hate it that so many papers in the areas of planetary science and geology are not easily available to the dreaded "non-subscribers". It is like they are screaming at me: "YOU CAN'T HANDLE THE TRUTH". Good, I feel better now.)

"Quaerendo inventis"