In this lesson we're going to be adding daylight sensors to our demo building in eQUEST. By the time most people realize they want to, or need to, add daylighting sensors, they're already in detailed mode. You can add daylighting sensors in detailed mode. You go to the building shell, and we click on a space and we want to go to the spreadsheet view. We're going to select the obvious option which is daylighting. Here's the tricky part-- daylighting is set to no for all of these. It seems logical that we could just set it to yes, and problem solved. But eQUEST is going to prompt us for some reference points in X and Y. This is where the sensors would be placed. We'll put in some dummy values-- 10 feet and 10 feet. We could analyze the room and figure out where we're going to place these, but as you can see, that would become pretty tedious. Depending on how far you are along in your file, believe it or not, it's much better to start daylighting in the wizards. We had added a dedicated outdoor air system but it would probably be less work to go back to the SD wizard and to add daylighting. We're going to go back to the SD wizard, but first we need to go to the mode and switch to the wizard data edit. Then we're going to click this little icon to get to the SD wizard. We're going to say yes, save changes, even though it doesn't really matter because we're going to lose our changes anyway. We need to go to the first screen and select daylighting controls. This is going to add daylighting controls to every space with a window or even spaces with skylights. We click finish. This is pretty cool because you can see that there's some indication that there's daylighting being added to these zones. Let's take a look at what this means in the detailed data edit mode. We go to detailed data edit, select a space in spreadsheet view, and we select daylighting. Now we can see that daylighting has been set to yes, and on top of that, the parameters have been specified-- the X, Y, and Z points for the daylight sensors. The Z point is at 2.5 feet which is at approximately desk height since that's the area where we're concerned, by default. The defaults for this are actually quite good. If you're a daylighting expert, there's a lot of room for change. In our experience, for most buildings there's not a lot of change when you go and get really technical about this. You might only see a 5% change by changing these values significantly. It depends. For instance, if you have a 20 foot wall with a 1 foot window on top, these numbers would start to matter. Under conventional practice where you have centered windows and standard heights, the defaults are very good. What happens if we had a parameter space such as the self parameter and we delete the glass out of it. This often happens in detailed mode. You're making some changes and maybe the glass gets deleted off of a space that had glass in the wizard. We deleted the glass out of that and now we try to calculate. You can see that the program is not going to be able to run to completion because there was an error. This error happened because we're trying to run daylighting in a space that has no glass. If we go back to the space, and we select this to no, now we can stimulate our file. It's going to run to completion. That's one of the most important things to remember-- if you added daylighting in the wizard and you deleted glass from a room, remember to disable daylighting if you deleted all of the glass. Finally, what's nice is if you started with daylighting and disabled it, and all of your spaces very easily, and it keeps the reference points. If you added in the wizard, even though you are tentative on whether or not you're going to have it, it's better to start by adding it in the wizard because we can always turn it off. Now we can easily switch it back on and it will enter the values simply based on the wizard. The defaults are pretty good for almost all typical buildings.