Hi, the new feature ent_nextlight should to work, but have not tested yet.

Note:
"The ent_nextlight function now stores light info in the hit struct, and can also detect WED-placed lights."

"Returns
ENTITY* - Pointer to the light emitting entity, or A7.82 level_ent for a level-placed dynamic light or the sun, or NULL when no more light was in range."