Well I would suppose everyone could be different. But since I posted I returned to the doctor to find a medical name for this condition. This is what it is called,
"polymorphous light eruption". The worse time I find is the beginning of the hot weather when you are outside working around or just enjoying the weather and I am not thinking about how much sun I am actually exposing myself to. When I am thinking I use a non oil base suntan lotion. Ombrelle is what I use. As long as I use the lotion the bumps are minimal.
The lighter side....I had my first reaction in 1996. I have seen friends and relatives also experience the condition and never get it again. Sometimes it can also be the medication you may be taking.
I wish you luck, I have just learned that if I am in the sun for long periods of time I have to have lots of sun screen with me and if I get the bumps I make sure I have hydrocortisone to take the itch away.