Light or lights must be bright enough to light up a 40 by 40 yard area does not have to be super bright. I assume it will involve a battery pack and led lights. Have about 500 dollars budget can't find anythng online to buy for this. If you can please help. Thanks

You will need a bigger wallet.

Battery packs, and especially LED lights, are expensive.

You may be able to buy a used portable light tower to suit your purpose: