You mean the 4' Feit LED shop lights? I just installed some of those yesterday. They have a pull chain on/off switch. The extra chain came in a little packet along with the light. If you purchased them recently, they should have the on/off pull. If not, exchange them for some that do.
Am I missing something? Why can't you just switch the outlet they plug into? If you don't want to do that, get a remotely-operated outlet. Google wireless remote control outlet.
I have picked up 12 of those for shop lighting. 1 Costco had them with pull chains the other Costco had not chains. For the cost they look like a good deal and the light is good