Quote from UDon'tKnowMe:
The only firms that use Lightspeed are ones that are setup like Tuco. These firms most likely won't be around in a week or two. I would really caution you from giving money to any firm setup like this. Also no firm that requires a series 7 or that is an exchange member uses Lightspeed. And these are the only firms that will still be around after a week or two. If you want to use Lightspeed you need to open your own retail account with them. That requires a $25k minimum and you will get 4:1 intraday.