why the same size ? if it shown at different box size, what different with a chopped shadow-candlestick ?
i dont use renko chart as my primary trading chart, but i do learn to use renko. it means to reduce market price distortion by put into a more simple charting, boxed, same size. when your trading style are price action related, a short period exit strategies, its important to get rid any price disruption, this where renk charting taking account.