Legacy GM Day Cycle

[Imperial]

Is this the best way to make the Light System, If no please suggest me the best way to do It
because this way use too much memory

Create Event

globalvar Light;
Light = surface_create(room_width,room_height);
Alpha = 1;

Step Event

surface_set_target(Light);
draw_set_color(c_gray);
draw_set_alpha(Alpha);
draw_rectangle(0,0,room_width,room_height,false);
draw_set_alpha(1);
surface_reset_target();

Draw Event

if surface_exists(Light)
{
    draw_set_blend_mode(bm_subtract);
    draw_surface_ext(Light,view_xview[view_current],view_yview[view_current],1,1,0,-1,Alpha);
    draw_set_blend_mode(bm_normal);
}
else
{
    Light = surface_create(room_width,room_height);
}

Creating the Light In End Step Event

if instance_exists(control_Light)
{
    size = 128;
    draw_set_blend_mode(bm_subtract);
    surface_set_target(Light);
    draw_ellipse_color(x-size/2-view_xview,y-size/2-view_yview,x+size/2-view_xview,y+size/2-view_yview,c_white,c_black,false);
    surface_reset_target();
    draw_set_blend_mode(bm_normal);
}