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Choose your projector according to the environmen

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Old 09-02-2017, 06:41 AM   #1
What is HD?
 

Join Date: Nov 2008
Posts: 1
Default Choose your projector according to the environmen

Dear,

I tried to build a formula that would allow me to choose the right projector according to the desired screen size, the available throw distance and the light level of the place.

The following is what I think I should do as a calculation. When I do it, the result is strange and not the same as the one of the calculator of projectorcentrale . com

Here we go..
I make a first choice of a projector like a reference in order to have a start point for the calculation. Based on the final result, the idea is to look for others projectors or keep this one;

1. base on the needed screen size, calculation of the needed throw distance
2. To integrate the effect of the throw distance level on the projector's power, I applicate the Inverse Square Law for Light: Power in lumens/(throw distance)2. By this way I have the exact quantity of light arriving on the screen
3. In order to calculate the lux level, I divid the quantity of lumens arriving on the screen by the size of the screen
4. in order to take account of the screen quality, I multiply the result in Lux by the gain of the screen..

The idea is to compare this result with the result I obtain while I go on the spot and measure the light level with a standard Lux Meter.

Normally, the light level arriving on the wall (coming from the projector) should be equal o superior of the ambient light level

What do you think of this method ? Where is the stupid point of view of it...?

Thanks a lot
brasseurbe is offline   Reply With Quote
Old 10-06-2017, 02:21 AM   #2
A couch and an HDTV to go please.
 

Join Date: Oct 2017
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Very insightful! Thank you for this. I will take note of this.
lemilee is offline   Reply With Quote
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