I can tell you that a transaction with one input and two outputs (including a change address) is around 224 bytes (so I guess 224 chars as well). I don't think there is much variation in size for transactions with one input and two outputs.

I don't know about LN, but I assume those transactions are Segwit transactions which should mean that their signature is detached from the transaction itself. So it should be smaller, perhaps twice smaller, since that is what they say is a new virtual size of blocks.