This constant is for use in the functions effect_create_above and
will create a flare effect as illustrated in the image below:
effect_create_above(ef_flare, x + lengthdir_x(32, image_angle), y + lengthdir_y(32, image_angle), 0, c_white);
instance_create(x + lengthdir_x(32, image_angle), y + lengthdir_y(32, image_angle), obj_Bullet);
The above code will create a small, white, flare effect at the indicated position as well as an instance of "obj_Bullet" when the mouse button has been pressed.