JVC 2011-2012 lamp measurement project - Page 3 - AVS Forum | Home Theater Discussions And Reviews
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post #61 of 391 Old 12-06-2011, 06:33 PM
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In which case one of the stock settings makes more sense to me as calibration updates in the future should not impact it...

BTW thanks for volunteering to coordinate this effort...
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post #62 of 391 Old 12-07-2011, 04:45 AM
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I am in. Will post when I get the projector. I have a meter.
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post #63 of 391 Old 12-07-2011, 10:14 AM - Thread Starter
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Originally Posted by rwestley View Post

I am in. Will post when I get the projector. I have a meter.

Great!

We have 25 people signed up so far, but we really could use a lot more.

Anyone who is on the fence, please sign up now! It should only take a few minutes of your time per month, and it really should provide some useful information to all JVC owners and prospective owners. You do not need to have your projector yet to sign up now!

Only two days left to sign up. Deadline is Friday, 9th December to sign up!

Just post here, or PM me, to sign up!
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post #64 of 391 Old 12-07-2011, 10:34 AM
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Count me in also, should be receiving my RS-45 in about a week or so.
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post #65 of 391 Old 12-07-2011, 10:53 AM - Thread Starter
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Originally Posted by nut4gadgets View Post

Count me in also, should be receiving my RS-45 in about a week or so.

Thanks for signing up!

By the way, anyone looking to delay signing up as long as possible, my previous message incorrectly stated the deadline as Dec 19th (it is fixed now). That was a typo!

The deadline to sign up is only two days away: Friday, 9th December.

Remember, you can sign up now, even if you will not have your projector for a while (even if you won't have your projector set up until January 2012).
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post #66 of 391 Old 12-07-2011, 10:58 AM
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I'll be hopefully getting my RS45 this Friday. I recieved my LX1010B from Amazon yesterday. I tested the entire process with my current 8yr old Panasonic PT-AE700 (I checked the menu and it has 3,700 hrs) and the reading I got was 65 lumens!!! I followed the instructions to the letter in this post, took 9 measures and as per the spreadsheet, that is the brightness I get. Does that look right or am I doing something wrong?
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post #67 of 391 Old 12-07-2011, 11:01 AM
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Quote:
Originally Posted by mouradb View Post

I'll be hopefully getting my RS45 this Friday. I recieved my LX1010B from Amazon yesterday. I tested the entire process with my current 8yr old Panasonic PT-AE700 (I checked the menu and it has 3,700 hrs) and the reading I got was 65 lumens!!! I followed the instructions to the letter in this post, took 9 measures and as per the spreadsheet, that is the brightness I get. Does that look right or am I doing something wrong?

My sons have a nightlight that projects the solar system onto their ceiling. That's about 75 lumens. I certainly hope that 65 lumens is wrong!

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post #68 of 391 Old 12-07-2011, 11:05 AM
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Tag as a Owner of a X90 Ill do it as well. Will order a light meter from a site in the near future
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post #69 of 391 Old 12-07-2011, 11:16 AM - Thread Starter
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Quote:
Originally Posted by mouradb View Post

I tested the entire process with my current 8yr old Panasonic PT-AE700 (I checked the menu and it has 3,700 hrs) and the reading I got was 65 lumens!!! I followed the instructions to the letter in this post, took 9 measures and as per the spreadsheet, that is the brightness I get. Does that look right or am I doing something wrong?

It sounds like something is wrong.

If you post your lux measurements, your screen size and aspect ratio (16:9 or 2.35:1), I will double check the lumens computation.

Also, make sure you have the range set to 2000 lux (the blue slider). If you have it on 20,000 lux, then your readings will be 10x lower.
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post #70 of 391 Old 12-07-2011, 12:03 PM
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Count me in. I have an RS45 on the way and it should be hooked up by the end of the year (finishing dedicated theater room build). I'm still debating between a cheap meter or something more expensive that I can measure contrast with. But I'll have a meter by the time I get the projector hooked up.

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post #71 of 391 Old 12-07-2011, 02:37 PM
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So was there a consensus on a cheap meter to order. Was just told my rs45 will ship tomorrow so going to order the meter tonight
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post #72 of 391 Old 12-07-2011, 02:49 PM - Thread Starter
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Originally Posted by scoobygt68 View Post

So was there a consensus on a cheap meter to order. Was just told my rs45 will ship tomorrow so going to order the meter tonight

If you want the least expensive meter that will work for this project, go for the LX1010B.

If you want a meter with better accuracy and (probably) 0.1 lux resolution, perhaps because you will use it to measure contrast or to compare your lumens measurements with others, the LX1330B was recommended by several people.
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post #73 of 391 Old 12-07-2011, 04:18 PM
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Quote:
Originally Posted by jim2100 View Post

It sounds like something is wrong.

If you post your lux measurements, your screen size and aspect ratio (16:9 or 2.35:1), I will double check the lumens computation.

Also, make sure you have the range set to 2000 lux (the blue slider). If you have it on 20,000 lux, then your readings will be 10x lower.

Quote:
Originally Posted by stevegravley View Post

My sons have a nightlight that projects the solar system onto their ceiling. That's about 75 lumens. I certainly hope that 65 lumens is wrong!

Screen size is 114. 16.9. Range on the meter was setup correctly.

My readings (top-left to bottom-right) were 17,19,17,17,20,18,16,19,17. For those numbers, the spreadsheet calculates 72 lumens peak and 64 ansi.

I don't know if it is an issue, but it seems that the throw distance does not make a difference (mine is at 16 feet)
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post #74 of 391 Old 12-07-2011, 04:39 PM - Thread Starter
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Quote:
Originally Posted by mouradb View Post

Screen size is 114. 16.9. Range on the meter was setup correctly.

My readings (top-left to bottom-right) were 17,19,17,17,20,18,16,19,17. For those numbers, the spreadsheet calculates 72 lumens peak and 64 ansi.

I don't know if it is an issue, but it seems that the throw distance does not make a difference (mine is at 16 feet)

The throw distance in the spreadsheet is not needed in the computation. I'm not sure why it is colored blue. Maybe the spreadsheet used to be used for another computation.

But the important thing is that your lux readings look very low. The lumens computation is correct. So the question is why are your lux readings too low?

What source were you using to display a white screen? Did it look like a bright white screen to your eye?

Did you have the sensor of the meter (the white part after you remove the protective cover) facing towards the projector lens? Not towards the movie screen?

Do you think your lux meter is working correctly? If I remember correctly, the LX1010B comes with a little pamphlet that shows common lux levels for various situations. Can you check if, say, a reading light gives the expected lux reading?
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post #75 of 391 Old 12-07-2011, 05:40 PM
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Just bought a lx1330b off ebay brand new w/ free shipping . And received my RS45 tracking info . Its a good night
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post #76 of 391 Old 12-07-2011, 05:56 PM
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Sign me up for the project. My RS45 should be here in a week or so and I'll be buying a meter shortly. Thanks for organizing this!
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post #77 of 391 Old 12-07-2011, 06:31 PM - Thread Starter
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Sign me up for the project. My RS45 should be here in a week or so and I'll be buying a meter shortly. Thanks for organizing this!

Thanks for signing up! You bring our participant count up to 32.

Anyone else on the fence, please sign up now! It should only take a few minutes of your time per month to make the measurements.

I'd like to get at least 50 participants in all, and 100 would be even better!
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post #78 of 391 Old 12-07-2011, 07:13 PM
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Initial Measurements

Date of measurement: 12/6/2011
Model of projector: RS45
Source of white field used (service menu, w6rz, calibration disc, etc.): w6rz
Hours on lamp: 7 hours
Whether lamp was primarily used in Normal or High Mode (or hours each of normal and high if you know): Normal
Normal or High Lamp Mode: Normal / High
Lens Aperture setting: 0
Warm-up time between powering-on projector and measuring brightness: 20 minutes
Measurement of brightness: 791 / 1089

For those curious, this was at 115" diagonal, 16/9, projector 16' feet away.

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post #79 of 391 Old 12-07-2011, 07:16 PM - Thread Starter
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Originally Posted by stevegravley View Post

Measurement of brightness: 791 / 1089

Looks good!

I'm glad to see the measurements start rolling in! I'm expecting my RS45 tomorrow, so I should be able to post my first measurement tomorrow night or Friday.
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post #80 of 391 Old 12-07-2011, 07:29 PM
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Quote:
Originally Posted by jim2100 View Post

The throw distance in the spreadsheet is not needed in the computation. I'm not sure why it is colored blue. Maybe the spreadsheet used to be used for another computation.

But the important thing is that your lux readings look very low. The lumens computation is correct. So the question is why are your lux readings too low?

What source were you using to display a white screen? Did it look like a bright white screen to your eye?

Did you have the sensor of the meter (the white part after you remove the protective cover) facing towards the projector lens? Not towards the movie screen?

Do you think your lux meter is working correctly? If I remember correctly, the LX1010B comes with a little pamphlet that shows common lux levels for various situations. Can you check if, say, a reading light gives the expected lux reading?

I'm suspecting that the meter I got is defective. I'm just going to ask Amazon to exchange it.
The white screen I used was the 100 IRE referenced in the 2nd post and everything else was done correctly.
You are correct that the manual has some numbers but those are recommendation for different activities - can't use them really to tell whether meter is working correctly on not.
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post #81 of 391 Old 12-07-2011, 07:35 PM
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Originally Posted by mouradb View Post

I'm suspecting that the meter I got is defective. I'm just going to ask Amazon to exchange it.
The white screen I used was the 100 IRE referenced in the 2nd post and everything else was done correctly.
You are correct that the manual has some numbers but those are recommendation for different activities - can't use them really to tell whether meter is working correctly on not.

Are there any switches on this meter? My Ca813 has 2 settings, one is 'FC', the other 'LUX'. It has to be set on LUX for these measurements.

edit: is this the meter?

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post #82 of 391 Old 12-07-2011, 07:38 PM - Thread Starter
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Originally Posted by mouradb View Post

You are correct that the manual has some numbers but those are recommendation for different activities - can't use them really to tell whether meter is working correctly on not.

Well, at a guess, your lux numbers are around 10x too small. So if the meter is really reading 10x too small, you could probably tell by measuring a reading lamp or something. If it is supposed to be, say, 1000 lux and you only get 100, then the meter is probably defective. But it is a strange defect if so.

I guess one other possibility is that your old projector really is that dim. But that would be about 1.8 ft-L x screen gain, and the typical target is around 16 ft-L.
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post #83 of 391 Old 12-07-2011, 07:40 PM - Thread Starter
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Originally Posted by zombie10k View Post

Are there any switches on this meter? My Ca813 has 2 settings, one is 'FC', the other 'LUX'. It has to be set on LUX for these measurements.

The LX1010B only reads in lux. It does have a range switch (2000...20,000...50,000) but he already checked and found the range was at 2000 lux, as it should be for this measurement.
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post #84 of 391 Old 12-07-2011, 07:40 PM
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Quote:
Originally Posted by jim2100 View Post

Well, at a guess, your lux numbers are around 10x too small. So if the meter is really reading 10x too small, you could probably tell by measuring a reading lamp or something. If it is supposed to be, say, 1000 lux and you only get 100, then the meter is probably defective. But it is a strange defect if so.

looking at a photo of the meter, the blue markings / switch looks like it's 2000, 20000, 50000. Maybe worth trying the other settings, it does seem 10x too low.

edit: oops, nevermind.. must be a bad meter.
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post #85 of 391 Old 12-07-2011, 07:48 PM
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Originally Posted by jim2100 View Post

The LX1010B only reads in lux. It does have a range switch (2000...20,000...50,000) but he already checked and found the range was at 2000 lux, as it should be for this measurement.

Correct. THe LX1010B has only Lux measurements. When the switch is on the 20000 or 50000 setting, the screen is pretty clear since it shows the multiplier.

I will definitely freak out if I get measurements like this on my upcoming JVC.
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post #86 of 391 Old 12-07-2011, 07:50 PM - Thread Starter
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Quote:
Originally Posted by mouradb View Post

Correct. THe LX1010B has only Lux measurements. When the switch is on the 20000 or 50000 setting, the screen is pretty clear since it shows the multiplier.

I will definitely freak out if I get measurements like this on my upcoming JVC.

When I put my LX1010B about 1 foot under a desk lamp (it is an LED desk lamp, so not particularly bright), I get a reading of 1445 lux.

What do you get under similar circumstances?

Another way you could get a rough check of the meter is to hold it about 1 foot away from a 60W incandescent light bulb, which should put out about 900 lumens. Since lux = lumen/meter^2, and the bulb is emitting roughly the same light in all directions, the surface area of a sphere with 1 foot (0.3m) radius is 4pi r^2 = 1.17m^2, so you should measure a little under 900 lux (900/1.17 if everything were exactly as assumed).
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post #87 of 391 Old 12-07-2011, 07:52 PM
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Quote:
Originally Posted by zombie10k View Post

Are there any switches on this meter? My Ca813 has 2 settings, one is 'FC', the other 'LUX'. It has to be set on LUX for these measurements.

edit: is this the meter?


I used this meter for my measurements at the 2000 setting and it worked great.

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post #88 of 391 Old 12-07-2011, 07:59 PM
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Quote:
Originally Posted by jim2100 View Post

When I put my LX1010B about 1 foot under a desk lamp (it is an LED desk lamp, so not particularly bright), I get a reading of 1445 lux.

What do you get under similar circumstances?

Putting it under a 14w compact fluorescent desk lamp (equivalent to 60w) shows 1920 lux.
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post #89 of 391 Old 12-07-2011, 08:02 PM - Thread Starter
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Quote:
Originally Posted by mouradb View Post

Putting it under a 14w compact fluorescent desk lamp (equivalent to 60w) shows 1920 lux.

That sounds about right.

So it is looking to me like your old projector is very dim. If that is the case, the JVC should look very bright!
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post #90 of 391 Old 12-07-2011, 08:08 PM
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Quote:
Originally Posted by jim2100 View Post

That sounds about right.

So it is looking to me like your old projector is very dim. If that is the case, the JVC should look very bright!

With 3,720 hrs old lamp, won't surprise me. The funny thing is that I got used to it and it is still "watchable" (granted I have a bat cave).
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