ic0n there's a reason the panels are so heavy. The boards you bought are most likely using signage grade lights which are not very efficient. They're bright but they don't do it efficiently so they need extra cooling. Plus it's running Zeners, which means you're powering diodes that don't give off light, just some heat. And finally, I can only guess it's a 2 die LED, which run very hot and either need to be running at a low amperage or have extra cooling and usually both. Are they single or double die LED diodes? Plus you've got 4 or 5 drivers in there too I bet. And probably not the most efficient, so again, more heat to deal with.
So take care of those panels, (reinforce your tent frame, bungie cords work great too as hangers) and run a good environment, (keep those temps steady), just don't get your hopes up too high. Wattage does not equate to growing power so you may not get monster production out of them. I've done this LED growing technique of throwing watts at plants and it works but the price you pay for the electricity used for the production you get isn't truly worth it. Then again I've been wrong before and will be more than happy to eat some crow when you grow do some monsters. So Best Wishes and Happy Growing ic0n! I hope it all works out for you.