These drives get their name from the speeds they accelerate the ship towards. The average consumer light drive can get the ship up to something like a third of light speed. High powered light drives are capable of two thirds the speed of light. The fastest light drives in existence are reported to go near 9/10ths of light speed. All light drives come with temporal displacement fields to prevent the effects of time dilation from negatively impacting the crew. The technology of the drives and the fields is sensitive to gravity and electromagnetism such that neither will operate in areas saturated with either. This makes planets, moons, and nebulae prime locations for pirate attacks.
Light drives charge quickly, but it does take some time to transition over from sublight engines.
Sometimes denoted as "LightDrive".
Not enough information for a detailed history as of yet.