Yeah. Paypal has a new quicker checkout used to buy stuff.
When you want to buy, you will have to enter your info (such as e-mail and your paypal password) and it will take the purchase out of the account which is linked to your paypal account.
When you sell the lights, you give the buyer your paypal (your e-mail address) and they send the money to your account.
You can then either deposit the money into your bank account, or leave it on paypal for future purchases.
You might already know some of this though lol.