Yep same thing! So for each of "dark" and "light", you need to basically calculate the difference between the value you've used and the maximum, and the value you've used and the minimum.
Look at this...
So here, the Minimum and Maximum columns are the actual minimum and maximum (i.e. the range), the "Min" column is mean-min and the "Max" column is max-mean. You want to do Add Chart Element > Error Bars > Standard error, right click on the bars and press format error bars, select custom and then specify value. Then under the Positive Error Value, select the "min" column and for the Negative error value, select the "max" column (click the little button next to "positive error value" and then click and drag).