Hi
just try to create light from editor - assign relevant class for it and set "render as light" option.
it looks like as light object , but it not lighting ground and other models.

please check somebody too: may be it's bug, because example with creating light from code - working fine

- Maybe the range is too small? Try scaling up the object, this will increase the light range
- Are you in Forward/Deferred rendering mode? Press f12 to set

Thank you - render mode was simple.