Jaak Suurpere wrote:

Do you have any idea how much less?

Someone else compared the bolometric magnitudes, which is a pretty good
first order approximation (the total influx of stellar energy would be
the same, but a red star would appear significantly dimmer than a yellow
one). By that reckoning it would be a difference of about 4 magnitudes
(less than a factor of 100 in illumination), but that only brings the
the magnitude from -27 to something like -23.

How large bolometric correction towards red would be acceptable for
terraforming?

I have no idea.

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