Hi Jan,
Internet has been down on and off due to weird summer storms.....I used to love natural/outdoor lighting, especially around evening when the sun hangs low and the harsh light is gone....I now do all inside....I will try to document and share some great tips I got from my brother (a NatGeo photographer) in the next few days/week or so, as time permits I'll try to do some side-by-side shots to show the difference between point and shoot/hand held and tri pod mounted stuff, also compare studio lighting with camera flash, please be patient with me, it will be fun! Thomas...

PS I have asked my bro to assist in finding something good for your wheelchair situation!

here is a picture shrunk to fit and also cropped to give a closer view