LED Light Bar set up, through cigarette lighter
The quick answer is that you should be OK, except that, if your 27 watt LEDs are 12 volt, they won't work, since in series each will only receive 6 volts. In comments Jasen suggested that the current drain may be too high. This discussion suggests that cigarette lighters are fused anywhere between 5 and 20 amps, so you'll need to check your owner's manual to find out just what your fuse really is. Also, I suggest getting rid of plug 2.3. The last thing you want to do is have someone plug in a lighter while the LEDs are on, since this will probably blow the fuse, and they are a pain to replace. Make sure any wiring is rated at the fuse current - Google on "ampacity" and use the smaller ratings for a given wire size.