The RADALT will always help day and night (BUS SHED OVRD SWITCH), the Landing Light good to have at night but nowhere near as important as the RADALT.
Will someone with a 135 to hand, please switch on the battery and prove with a vid which services are actually available as we continue down this non sensical rad alt/ landing lamp EMBUS pathway.
The more I read this, the more Herrings and Red spring to mind.