When Zoom out font, don't enlarge the weight of font

[filebat]

Hi all
When I zoom out font by "M-x text-scale-increase",  fonts become too
bold.
Is there any way to make sure the weight of font is not enlarged so heavily?

I noticed that when I trigger "text-scale-increase", only fonset changes.
Say, change from "-outline-Lucida Sans
Typewriter-normal-normal-normal-mono-15-*-*-*-c-*-iso8859-1 (#x10)"
to "-outline-Lucida Sans
Typewriter-normal-normal-normal-mono-18-*-*-*-c-*-iso8859-1 (#x10)"

I tried to change the font step from 1.2 to 1.1 like below. It looks
better, but doesn't solve my problem.
(set-default 'text-scale-mode-step 1.1);;Set the zoom rate

Thanks,
Denny
-- 
Smile for difficulty, Denny!