This tutorial shows how to use the mesh_light with motion_blur and atmosphere_volume to create a long exposure lighting effect.
Mesh lights: https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_lights_ac_mesh_lights_html
Motion blur: https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_render_settings_ac_motion_blur_html
Atmosphere volume: https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_core_ac_atmosphere_volume_html
#arnoldrenderer #arnoldrenderer #maya #shading