Hi ZIns, Oberon offered professional technical details so I will chime in with homeowner experience. Yes, even with Low-E, there will be fading. Depending on the amount and intensity of exposure and the finish, it is a matter of how much and how soon. In a situation where the sun is very mild and light, by the time fading is noticeable, it may also be time to refinish the floor. My guess is the floor is not receiving year-round exposure, true? The sun is stronger and deeper during some time of the year and weaker and less intense at other times, is that so? We have seasonal sun intensity problem too and solve it with a combination of solution. We use rugs to protect several sections of our floor during mid-Spring through late Summer. The rugs are removed to prevent tripping when we have visitors. The rugs are also removed around Autumn when the sun is low and the exposure is much less intense and shortening each day. We have old furniture in one area by our French doors and my wife made knitted coverings to cover the furniture. As necessary, we remove the covering when appropriate. Outside the French doors, we installed retractable awning so that during extremely hot summer days, the awning extends to provide cover without blocking natural light. Our goal is to not use any window treatment because we enjoy natural light and the views. Hope this helps a bit.

Compare the VT ratings on the two glass pack options and that will tell you which unit provides more natural light. In this case the SunCoat Max (Low-e 366) will give you more light as compared to triple pane. It will not be as thermally efficient but if light is your concern, the SunCoat Max option is the better of the two. Triple glazed does mean triple pane.

I posted a follow-up on the other thread where I commented and decided to post here for anyone else who does a search for problems from the green reflected light from Low-E glass. This is a long post but it captures the relevant information about what I tried to eliminate the green. PART I: Our great room faces west and has three large patio windows (8' tall and 12' wide) made of Low-E glass which cast a green light inside the house. The ceiling height in the dining nook and by the patio doors is 10', and with the vaulted ceiling is app. 13' at the highest point in the middle of the room. Outside the great room, is a covered patio which is about 10' high. Since I know how hard it may be to track what I described, I included our floorplan showing where the sun is in the afternoon. As the light enters the room the color changes. In the morning, the great room looks grey and dingy so I leave the warm 3000K LED lights on. In the afternoon, on the wall with the door to the laundry/garage (yellow arrow), from floor level to about 8', Creamy is light creamy yellow with a greenish hue. And then, from 8'-13' it looks less green and has more of a sickly grey tinge. On the wall in the kitchen (the other yellow arrow) the color is darker but has the same green look to it. I invited our new painter over so that he could see what I've been talking about since I'm trying to decide which is the best color for this space. I showed him the wall directly across from the patio doors (yellow arrow). He said he could sort of see what I meant about the wall color looking like it has a hint of green Then I opened the patio door, all the natural light flooded in and the color was much brighter - the way that I expected Creamy to be. He was shocked, saying he'd never before seen the color of walls change as much. So, it's not just the paint color. It is the color, the light(s), the direction of the sun and, in our case, the Low-E glass. PART II: So now that I know that the Low-E glass we chose is definitely casting a green on our rug, furniture and walls. I've been trying other colors that are still light and bright without picking up the green. I tried SW Panda White, but it still had the dingy green/grey. Then I tried SW Downy and it is nearly identical to SW Panda White but has a bit more pink or peach. But it doesn't look pink/peach. It is also not nearly as muddy, dingy or green as Panda White. And it actually looks Creamy!

@Mia Smyth Recent commentary from another poster: https://www.replacement-windows.com/windowbb/viewtopic.php?t=1555 I actually have both the Sun Coat and now the Sun Coat Max. All my windows face South and West and the sun is very strong. I live in CA. The 2 sliding glass doors I purchased about 4 years ago have just the Sun Coat. Its terrible I continually find myself closing the black out drapes. The room is hot and very cold at night. I am happy that I ordered the same Milgard Thermally Improved windows for my entire home with the Sun Coat Max. We have not had them installed yet although I did place the window in the living room on the floor and can tell I will not have to keep closing the drapes and hopefully will not need window coverings at all. I can definitely see the difference. I hear they make a room more comfortable and I can see why.