Easily fill-in the parameter let the excel sheet calculates the recommended projector brightness to achieve a specific System Contrast Ratio as per AVIXA 3M-2011 in addition:
- It calculates Throw Distance based on the Lens Throw Ratio based on AVIXA standard geberal formula (always check with the manufacturer).
- It calculates Pixel Width and Height based on the given information.
- It considers Ambient Light and Screen Gain.
- It calculates Image Width/Height based on a given Aspect Ratio (16:10,16:9 or 4:3).
- It calculates the image illuminance in Lux based on a given projector brightness in Lumens.
- Only Metric System is considerd in this version. 
 
Notes:
- Always check with the manufacturer and consider 5% error margin for all calculations.
- The calculations here are general for basic estimations and based on AVIXA standard with no liability on the author.
- You can edit the excel sheet as per your pereference with Unprotection Password: "123"
- Using this file supposes preliminary knowlege of MS Excel.