A few thoughts on lighting, with LED's being a passion of mine...
Deep cycles are great as they don't mind going flat so much, where a car battery will die quickly if flattened too many times. INVERTER OPTIONS:
They are easy, but they an ineficient so they chew more power than they provide, flattening your battery qucker. Get a big battery, and attach things sparingly.
If they get wet, they die. MY RECOMMENDATION TO THE NON TECHNICAL:
Buy 12 volt stuff! Easy.
Less LED's over a wider area are better for power consumption. I run mine dim, at night that's all you need.
12 volt LED strip, waterproof, with dimmer for lower power consumption!http://www.ebay.com/itm/Waterproof-12V-5m-warm-white-5050-led-flex-strip-lamp-mini-dimmer-30leds-m-/251202508965?pt=Motors_Car_Truck_Parts_Accessories&hash=item3a7cd618a5&vxp=mtrEASY 5 VOLT USB REGULATORS:
USB converter outlets for ciggarete lighter sockets have a regulator in them that will usually supply 1 amp.
You can pay more at an electrical store to get ones that give up to 4 amps. You can buy battery clips with a ciggarete lighter attached.
A USB fan will fit snugly into the USB adapter.
3 amp regulatorhttp://dx.com/p/dual-usb-car-cigarette-powered-charger-purple-12-24v-72994
Battery Cable $4.50http://dx.com/p/cigarette-lighter-dual-socket-with-alligator-battery-clamps-cables-82625MY SETUP:
I run 3 volt LED lights i found at Ikea. The lights are incased in a yellowish plastic so they look warm.
I built a 3 volt switch mode regulator, variable to 1.5 volts which acts as a dimmer and reduces power consumption.
A regulator also helps buffer the lights from a flattening battery, so the batter can drop right down to 5 volts before the lights start to dim.
At 200 ma for the entire 10 meter run of LEDs it can run for some 40 days straight. NOTES ON LEDs:
They can chew power, but generally use less than conventional lights.
The sharpness of an LED is caused by the light source being a pinpoint. You can diffuse them by inserting a ping pong ball over them.
Get the voltage supply right or you could blow them up!