The 120 volt reading could be from a ground or back feed. If a neutral is present from the breaker box, it will be white insulated.
The LED lamp in the link is a great choice as it will work on 240 volts as well.
On 5/31/2013 6:29 PM, Ed wrote:
Hmmm, not sure about the neutral and/or ground. The pump control relay has 4 sets of contacts, 4 wires coming into the relay box, and with a meter each pair of wires measures 120. I found the following on ebay, maybe I could use it on 240V? Ed
http://www.ebay.com/itm/10-Watt-LED-light-Waterpoof-Outdoor-Security-Floodlight-Flood-Light-110V-85-264V-/330883117952?pt=LH_DefaultDomain_0&hash=item4d0a2bb380
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