It is the Luxor Sky Beam, a 42.3 billion candela tunnel of light - the strongest in the world - that shines exactly vertical from the 39 xenon lamps on top of the Luxor Hotel and Casino in Las Vegas.
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Wikipedia (the “searchlight” article) says 39 bulbs produce 13650000 lumens — it also says the beam is 9.129 billion candela.
In the touristy areas of Luxor and Aswan, you don't have to dress as modestly as you might in the more local parts of these cities. For example, while visiting Philae Temple in Aswan you might wear a sleeveless shirt and a pair of shorts.
Certain areas are bustling and boisterous, but for the most part, it's a more laidback experience than Cairo. Blockbuster sights here are packed closer together, which means you can cover more ground on a shorter trip.