wondering if bringing an elevation view into the diagram would help, now could not tell if a light is being placed low aiming up or up above aiming down

Thank you for your feedback.
This is a feature we considered before launching the app but it would involve a good deal of work to provide that functionality. We came to the conclusion it would be easier and just as informative to add degree icons to the grid with + and - symbols so you'd simply add a +45º icon if an object is tilted up from the floor 45 degrees and a -45º icon if its tilted 45 degrees down to the floor.
Please vote this up if you'd like to see this feature added.