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No. It is not. But you need someting to attach your longhose to, and you need a suitable primary light with a proper goodmanhandle. Talk to your instructor. Ask them if your light is acceptable for the class, or, if it is not, if the instructor has one you can borrow/rent.
It may be a useful skill to learn to handle the cord of a corded (canister) light and to otherwise become comfortable with a canister light. Even if one owns a cordless light, one may find themselves in the position of needing to borrow a light, and the only light available to borrow may be a canister. I have heard this argument from an instructor, though it was now a few years ago. Perhaps enough people are using cordless lights now that a diver who needs to borrow a light will almost certainly find a cordless light to borrow.
He will still learn the moves "as if the light was corded". It is a part of the gas sharing exercises.
