Assuming you have consistent power there, you can tap an outlet off of that box and utilize that where you need to place plugs. Be sure though that you utilize sealtight and weatherproof enclosures for your install. Because it looks to be over 6ft, you will not need to add them to GFCI, since they are out of reach. Do not use socket adapters, as you have motion lights and you'll have power interrupted everytime the lights shut off, or if they're never triggered to come on. Given that they're motion sensor and they have and internal photocell you'd never have power during the day coming off of the fixture directly