Just got round to reading this dude. You're right in what you said it could easily be part of something much bigger however I like it just as it is. As my old art teacher used to say sometimes enough can be too much.
The title 'real light' could be a number of things really as in you could have been talking of the sun, stars or moon etc.
The first two lines are questionable as in why would you want to pull the moon down from 'the place it occupies' the sky? What has it ever done to you.. Is it too bright so it's stopping you from sleeping then close the blind/curtain good fellow =) in all seriousness it's very intriguing and definitely makes a reader want to continue.
The last two lines explain why you'd want to pull the moon down because, you want to gift something special to the one you love and make sure that they know how much they're loved too.. Maybe it's a special birthday or anniversary and it's just something you need to do. I didn't completely understand swapping roses for weeds - I would have assumed it would have been the opposite way around as most woman want hives flowers, usually roses, but then the lady line reveals all because fireflies will not be cheap, if in fact you could buy them at all.
I think this is the smallest ever poem I've read from you and I'm absolutely gutted I couldn't nominate it. It's perfect and magical.
Bravo Ben, as always,
Take care x
Thanks so much, Em. 'Real light' meaning fireflies generate their own light but the moon doesn't. 'Roses for the weeds' because you would assume that fireflies were not as great a gift as the moon would be. But (coming back to the title) they do emit real light.