If you want to improve your budget and spending, then the best option that would save you the most money would be buying the securities for a long period of time on fixed basis. This will allow you to hold your savings with the bank, and you won't be able to take them out easily before the term period. In this way you won't think of spending that money. Also you can have an interest amount earned on these securities. In this way you can save the most money.
There are up to 12 lights and or plugs on that circuit. A 1000w HPS or Metal Halide light takes 9 amps at 120 volts so you can only run one on a wall outlet circuit. A standard dryer outlet is 220 volts and 30 amps so you can power up to six 1000 watt lights on that circuit.