I can't say if there is a mistake in your table, but what I usually use is here: http://www.jollinger.com/photo/meter...eed_table.html
(towards the botton of the page).
And also on page three of Weston's manual: http://jameskbeard.com/Photography/W...on_Ratings.pdf
And here: http://www.westonmeter.org.uk/speeds.htm it is also Weston 80 = ISO 100.
It also states this:So it should be possible to work out what 400 lumens (cd/ft2) relates to.Up to the Master IV the scale on the dial is in cd/ft2 - foot candles, now known as Lumens. After the IV, Weston started to use arbitrary numbers. With the baffle open, the scale is from 0.2 to 50 and with the baffle closed, 25 - 1600. Note the overlap - it's usually best to use the baffle-open in this overlapping area as the meter is more accurate there.