For all that have responded to my question, thank you. 74 reply's and
all offering excellent, intelligent, and clearly safety concise
advice.

As pointed out, the 240 volt - 3 wire (no common, just ground) is what
I have. Common I would assume, is the alternating current line of one
of the hots when not sending current, thus switching back and forth.
This I do remember from my basic EE courses.

My dilemma, the 240 volt pump circuit is approximately 200 feet from
the electrical panel buried beneath a cement slab, thus pulling a new
120 volt line was not an option.

Therefore, the suggestion of either using 240 volt lights, a 240 volt
to 120 volt transformer, or which no one suggested, SOLAR lighting may
be my only options. If I choose one of the first two, I will take
everyone's suggestion and hire a licensed electrician!

I must say, usenet groups are very helpful in understanding options
and again I thank you all for first, qualifying that safety is the
most important criteria, and cost the second.

Regards