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They are sold in boxes of 2, 4, and 6 bulbs
Not necessarily. They can be brighter, or less bright. Both the energy saving light bulbs and the old-fasioned incandescent light bulbs come in different powers.
Different makes use different bulbs, need to know what vehicle you have.
No one needs to be smart as this!
Different kinds of light bulbs
There are a huge variety of different bulbs powers offered at Light Bulbs Direct. They have lightbulbs designed for nearly every kind of wattage desirable.
The difference between the two bulbs is that energy saving bulbs have murcuary in them which lowers the amount of electricity they require and consume.
By buying and using new LED light bulbs, it is possible to save 12% of energy which is 90% more effective than other light bulbs and can save about $26.
Headlight bulbs, high and low beam, parking light bulbs, signal light bulbs, brake light bulbs, dash light bulbs, interior light bulbs, plate light bulbs, etc.
Why do you think? Light bulbs are cheaper, produce more light, don't require matches to light and don't produce waste products such as carbon dioxide. The discovery of electricity made light bulbs possible.
Parallel.
CFL or LED