Lutron Electronics Engineer software Design and Development interview questions

Applied online through glassdoor and got response (about a month later) for an phone screen. 2 phone interviews, one HR screen and one technical screen. After this I was called onsite to their headquarters at Coopersburg,PA. They give a tour of their experience center showcasing all their new and upcoming technologies. Then the interviews started around 9 and went on till around 4:30 with a few minutes of gap between each 60-90min interview. The guy who took my technical phone interview took me out for lunch to a nice restaurant and was nice and friendly and helped calm my nerves for the rest of the day. Great experience talking to some very smart and innovative people. A couple of days after the interview they started calling my references. Now I thought they would let me know before they call but they didn't and I couldn't let my references (previous and current bosses!) know ahead of time, anyways it turned out okay I guess. On speaking to my references later, I found out that it was like a 30-40 minute mini interview for them asking detailed questions about me varying from personality to cooperativeness to technical success/failures etc! So think carefully before putting down references. After this I was asked to take an online personality/IQ test and submit my transcripts. A couple of days after finishing the test and uploading the transcripts, I got the all coveted offer call!