Flashlight trigger

i want to make a flashlight spell/trigger. i want it to be like an auto-cast. when its on, it increses the sight of the unit. and when it turns of, the sight is back to normal. it cost mana.

this is extra, but, i would like it to be only in the front.
thanx

you could use visibility modifiers.

make a custom ability of buff (don't really no which you have to figure that out) and do...

Events: A unit begins channeling an ability

Conditions: Ability being cast equal to flashlight

Actions: Ability add (the buff or ability to casting unit)
Wait however long and do
Ability remove flashlight from casting unit

or i supose you could make it with an item

Events: A unit begins channeling an ability

Conditions: Ability being cast equal to flashlight

Actions: item add (whatever item to casting unit)
Wait however long and do
item remove flashlight from casting unit

but how would that actually make the light?

make the mdl of the spell or buff the light or i guess you could make an invisible dummy with locust that is the light

how do i do that?