If your reference to bulbs is light bulbs then yes they can be mixed. The led lamps have to be ballasted to use them in home lighting.
Halogen Bulbs
No.
Don't understand the question fully but halogen bulbs can replace incandescent bulbs and is 30% brighter for the same electrical power.
Green computing refers to IT or computing with the least negative impact on the environment. Newer monitors and displays use light-emitting diodes (LEDs) instead of fluorescent bulbs which reduce the amount of electricity used by the device.
parallel
Incandescent light bulbs are used, in addition to LEDs. LEDs or laser emitted diodes, produce the different colours with different electricity molecules mixing with the oxygen in the air
It used to be. Lots of toys have small light bulbs in them, and the filaments in light bulbs are made from tungsten. In modern times, they're more likely to design those toys to use LEDs, which are tungsten-free.
We don't use ballasts for LEDs. Ballasts are used with fluorescent lighting fixtures to both step up voltage to fire the tube and to provide an in-circuit load when the tube fires and conducts. LEDs have a series resistor either integral to the LED or separate to it which limits current in the LED when it is turned on.
Lighting is not one of the major electrical costs in a house, especially if CFL (compact fluorescent lamps) or LED bulbs are used. If lighting costs are an issue, get rid of incandescent bulbs and halogen bulbs. CFLs are cheaper and nearly as efficient as LEDs.
Yes, they provide as much light as the incandescent bulbs, thought some may vary according to their own type. But there's no other way that incandescent bulb can be compared to LEDs, because LEDs are way better than the old traditional bulbs.
It depends on the circuit design and ratings, and what you expect from the bulbs. Bulbs connected in series with each other will have the same amount of current flowing through each one, but possibly differing voltages dropped across them, depending on their ratings. Also, with bulbs connected in series, if any single bulb burns out, or is switched off, or is removed from its socket, then all of the bulbs in the series circuit go dark. Bulbs connected in parallel will have the same voltage across each one, but possibly differing currents through them, depending on their ratings. Always check what type of circuit is in use and what it is designed to do, and ensure the appropriate rating of lamps are used.
It is very beneficial to have a parallel circuit... for example: 1. If one light in a parallel circuit goes out, the other light bulbs will remain lit Whereas if a light in a series circuit goes out, all bulbs will go out 2. If not all light bulbs are needed on, you can turn them off with the remaining light bulbs staying on