No lighting was added... The panels are located in an island in the middle of the I-5/I-205 interchange, so there are some lights around. One of the claims/reasons given for doing the project, is to offset the power consumed by the highway lighting. This was a small-scale test project for an even bigger project up the highway which is currently stalled not because of the cost or perceived benefit, but because the rich people across the river claim it will be too ugly to look at on the hillside.
Here's the monitoring data, with some very basic project info:
http://live.deckmonitoring.com/?id=solarhighway
