We recently took a quick weekend away in Dallas, and stayed at the Lumen on a recommendation from a friend. It had a cool, Hollywood Hills in the 60s vibe. The glass lobby and bar surrounds the pool and is stylishly decorated. Drinks from the bar were great.
Beware that there are rooms without windows here - I mistakenly booked one. Mine was called the "King Room" and I don't recall that the website designated that it was an interior room with no window to outside. That was pretty odd and caused me to lose some points with my fiance.
Otherwise, the bed and linens were good, it was clean and quiet, and the location was good.