 Now we're going to examine how much lighting do we need, and so it depends on what kind of task are we doing. Say if you're just walking in a hallway, you need the simple little bit of light to see each other and to recognize what is there. That lighting is called ambient lighting or general purpose lighting. For example, I'm sitting here in this conference room and trying to take notes or reading a book. And this type of lighting, the type of lighting that I need here is called task lighting. I am doing a specific task of reading a book. Or you can take another example of cooking, you know, you're cooking something and you need to know exactly whether it is done or not, you need lighting there. That is again, task oriented lighting. So it depends on the task that you are doing, there are three types usually. First is the ambient, the second one is the task lighting and the third one is accent lighting. The idea there is you want to highlight certain aspects, maybe a painting, maybe a statue that you own or any other thing, a map, you know, whatever you want to highlight instead of highlighting the entire room lighting, you can highlight that particular piece with some special lighting and that type of lighting is called accent lighting. And how much light do we need also depends on the age of the group, age of the people that are in there in the room. Obviously older people need little higher amounts of light than younger people. And also the speed and accuracy with which we want to do certain things, say for example a person is repairing a small wrist watch here. Obviously they need more lighting specifically especially if they want to repair very fast. So speed and accuracy with which we want to do a job also dictates how much light we want.