The partial darkness will make a computer projector easier to see from the back of your room while the light will aid both you and your students. Complete darkness makes it difficult for your students to keep focused on you and also makes it difficult for them to take notes on what you are teaching. So by keeping some lights it helps you to see your students and gauge their understanding of the material while the students can see their papers to take notes. Line of Sight One of the biggest problems in current labs is that they are designed for maximum number of computers rather than facilitating learning. If you plan on lecturing in a computer lab, make sure that you design your computer lab so that students will be able to see you while your talking.
Computer rows all facing front.
This design is typically for computer labs where students will be expected to work independently. Although all of the computers are facing the same direction, it is often difficult for students in the back of the classroom to see what is going on in the front of the lab. This design is also very distracting to students farther in the back because they have to look through all of the other screens between where they are sitting and the front of the room. A simple solution to this is to have them turn off their screens when you are trying to teach. Central focus is the teacher area with a teaching screen, or projector.