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I have compared the Draper XS850E material to 5D from Stewart and DNP Supernova.

Stewart materials are gray but they are not an engineered screen material in the same category of the Draper XS850E and the DNP Supernova. In a dark environment the Stewart screens are fantastic products that perform amazingly well. They are however for dark <3-4fc ambient levels. So they just aren't for all applications. Especially high ambient light.

When it comes to ambient light rejection, the Supernova 08-85 material is much better than the XS850 material. The Draper XS850 does reject ambient light but not nearly to the same efficiency as Supernova material. For moderate ambient light 6-20fc off axis to screen perpendicular use the XS850 and it will hold its own relatively okay. Beyond that use the DNP. I.E if you have a side window DNP it is. or You get what you pay for. If you need much higher rejection then it'll cost. If you want moderate rejection then you can save a bit and get the Draper. :-)

To speak to projector contrast. Bluntly. It next to irrelevant by the spec. I have measured with the proper tools projectors from almost every manufacturer, and unless you are talking high power 3chip DLP units from Barco, Christie, NEC, Projection Design etc, the specs sheets are mostly marketing garbage. Getting a final image in a room after setup that is above 250:1 properly is incredibly difficult. The room itself is the problem. How many people have a black room (including the ceiling) with black furniture, wear black clothes etc... Contrast is a system value NOT just a projection value.

To speak to projector brightness. ANY screen with less than 1.0 gain requires the projected light per sq ft to be higher. Can a 600 lumen do the job... maybe. How big is the screen? Lumen is total light by area, increase the area you need a bigger engine (projector). Also where in the lens throw is the projector? Most lenses are brightest near the front and sometimes by significant amounts! I have measures 40% light loss on lenses before, and a 25% sway is common. Yes COMMON. Buy a light meter or a colourimeter and check.

This is why screen like the DNP, and Draper are actually great things for home theatres. They enable a real world usable room to be a theatre room AND maintain a contrast level that would be unobtainable without them.

Even Stewarts material is great for rooms where ambient is from the system itself and from lower light sources. Dimmable lamps, or floor lighting. And yes it still requires more output power net. To speak to why show a white screen (which I think is brilliant), its because it shows why this type of screen is beneficial as a TYPE. Showing against the same type screen is product comparison like a granny vs a Royal Gala apple. This is an Orange vs and Apple article and product.

Robert, what are the direct and indirect ambient light measurements in your room at the screen location? You can use fc or nit. What is the size of your screen? What is the measured white output of the project with the lights off at at the screen center, and at 8 points around the edge? What is the black levels with the lights off at center? What is the black level with a half full white square on one side and visa versa?

For this case use all measures towards the projector with a diffusion filter on the projector to remove your current screen from the equation.

Also if you want to post bulb hours and projector model that would help.

Cheers James