Welders work in low light conditions underground.
it is bright down there
A low light condition is, by definition, dim.  It is not bright.
exists e1 s1 s2 s3 x1 x2.(a_underground(s3) & Manner(e1,s3) & in(e1,x2) & n_condition(x2) & a_light(s2) & Theme(s2,x2) & a_low(s1) & Theme(s1,x2) & Actor(e1,x1) & v_work(e1) & n_welder(x1))
exists s1 x1 x2.(down(s1,x2) & rel(x1,x2) & n_location(x1) & Theme(s1,x1) & a_bright(s1) & n_thing(x1))