Can Jedi use Force lightning?

Use by Jed. Force lightning ability was not restricted to dark-siders. Jedi and other light-siders who were strong of will and character could learn this power without falling to the dark side-but its use was viewed as inherently corrupting, and most Jedi Councils forbade its use.

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Then, how much damage does dark aura do?

Is black a power color? Black is the color of authority and power, stability and strength. It is also the color associated with intelligence (doctorate in black robe; black horn rimmed glasses, etc.)

And another question, what does black stand for?

Black represents evil, darkness, night, and despair. It's the color used to convey certainty and authority, and when used in opposition with white, it's a symbol of the eternal struggle between day and night, good and evil, and right and wrong. What does black symbolize positive? I can think of no other color that stimulates equally powerful positive and negative associations. As a color of mystique, black conjures elegance, sophistication, and sexual prowess. It is associated with strength, authority, and power.

Thereof, why is your favorite color black?

Some say that black is the colour of success! It is an aggressive colour, which gives a certain sense of power and dominance. Black is also considered to be a threatening colour, by definition black is the absence of light, which may be the reason for the fear that some people have of the dark. Also, what does it mean if you like black? People who like black color are usually conventional and conservative. As someone who is contained, they are often very proper and polite. If black is your favorite color, you're above average, but without being arrogant.