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obj/HUD/General/Lighting    //add to client.screen
    plane=1
    mouse_opacity=0
    Darkness
        alpha=224
        color=rgb(0,0,0)   //this inverts the color, since BYOND can only do negative color failmath.  This would allow you to change the global/ambient light color, if you wanted
        icon='Lights.dmi'   //icon for this should be a solid white square
        blend_mode=BLEND_ADD
        screen_loc="1,1 to 17,17" //adjust the 17,17 with world.view
    LightPlane
        //this does nothing, but some kind of magical internal rendering
        screen_loc="1,1"
        blend_mode=BLEND_MULTIPLY
        appearance_flags = PLANE_MASTER | NO_CLIENT_COLOR

obj/Lights  //use however
    plane=1
    density=0
    mouse_opacity=0
    icon='Lights.dmi'   //also white, but use transparency for blending
    blend_mode=BLEND_ADD
    Round
        icon_state="Round"
    FlashLight
        pixel_x=-32
        pixel_y=-32
        icon='LightFlashLight.dmi'
    Headlight
        pixel_y=-32
        icon_state="Headlight"
        icon='LightFlashLight.dmi'