Video Bias Lighting (SMPTE Recommended Practice- CIE D65/6500K White Light Only) - Page 55  

Yes, the tan in the photos. Thanks for the information. Do you have a link for Ideal-Lume? I Googled it, but all I came up with are a bunch or reviews, but nowhere to buy and no home page.

Nevermind-Found it. Thanks.

You'll want the Panelight model since your panel is mounted. (It's the second product on the page)

http://www.cinemaquestinc.com/ideal_lumesb.htm

Thanks for your help. It's much appreciated.

I certainly think everyone's entitled to their opinion.

Thank you and I certainly think that you are welcome to yours as well. How about joining me in deleting all of our off topic posts? We can clean the thread up and avoid having a moderator do it for us.

Your wall color is very similar to mine. I have a wall mounted lcd and use the 2 light panelight setup and am very happy with it. I haven't taken measurements or tried other solutions, but to my eyes, it looks very good.

Murray

Thanks for the information. This is something I'm still trying to make up my mind about. I'm not sure yet if I want to stick with while or go colored. I'd really like to use a color-changing setup and have the option for several colors, but the ones I've seen so far are a bit pricey.

If you are considering colored back lighting while watching TV, it should be with the understanding that image fidelity is impossible under those circumstances. This article explains why: http://www.cinemaquestinc.com/ive.htm .

Thanks. I'll check that out.

can anyone suggest a remote controlled light that I could control from the couch and turn on at night?

George, How will the IL standard look when I raise my wall mounted center speaker up to the proper level for the new TV? New stand arrives tomorrow and is the same height as the temp stand.

The bottom of the center channel will be even with the top of the screen. The center channel will not fit in the stand.

Will blocking out that much light with the center channel effect the lighting in a negative way?

Sorry for the messy pics of my temp setup.



Here is a pic of my old setup with 65" DLP, just so you can see how the center channel will be raised up:

I think this thread may have more "off topic" posts that any AVS thread that I've read.

The title tells the whole story, or at least it should.

"Video Bias Lighting (SMPTE Recommended Practice- CIE D65/6500K White Light Only)"

Anyone who is only interested in putting a light behind their display would be better served to look for, or start a thread on that topic. It's a worthwhile topic.

On the other hand it has nothing to do with this thread which is intended to discuss one specific type of bias lighting standard -- SMPTE Recommended Practice- CIE D65/6500K White Light Only.

Remember to enjoy your display.

Many people use one of the switched outlets commonly found on the back of their AV Receiver. When the sound is switched on, the light powers up. The down side to this is that the light comes on even if the room isn't dark enough to warrant using the bias light. Therefore, lamp life is wasted.

There are an assortment of various solutions for automating the switching of a bias light featured in the accessories section of my web site. Most include discrete remote control-ability via infrared or radio frequency (RF).

Best regards and beautiful pictures,
G. Alan Brown, President
CinemaQuest, Inc.
A Lion AV Consultants Affiliate

"Advancing the art and science of electronic imaging"

Feeth,

Your center channel speaker won't be a problem. My system at home uses a huge Klipsch center speaker on top of my TV cabinet and I still benefit from the bias lighting above and around it. In fact, my side speakers are huge old Altec 19s, which block all the wall at the same height as my cabinet. The end result is only the wall above all this gets illuminated. It's still effective. The illumination doesn't have to completely surround the TV for most of the benefits to be realized. My display is an HD direct view CRT, so I don't really need the perceived black level and contrast enhancement the technique can provide. Surrounding the screen with back lighting would increase this benefit for folks who can provide such conditions.

The so-called "$20 solution" is not a product. It's an attempt at emulating a pre-assembled, complete product. Also, where's the "Screen Snapshots of Scientific Measurements" of the lamp which claims to be "6280K and 94.5 CRI?"

feel free to send me your product with the bulb unattached to the fixture unit for $40 less than the current price and free shipping

Verilux's contact info is available at the following link
http://www.verilux.com/

feel free to request "Screen Snapshots of Scientific Measurements" from them if you doubt the validity of their product packaging

I'm off to take some peanut butter, jelly, and bread and make myself a peanut butter and jelly solution
the peanut butter does say extra crunchy on it but I'll have to verify that myself .... later

How exactly are you dialing in the correct light output?

BTW...I'm guessing that's synthetic peanut butter and jelly which almost tastes like the real stuff...

This dialog has become childish. Have it your way and be happy.

George, Thanks very much for your help and support of your product.

I should have the new stand together and hopefully everything setup by tomorrow evening or early Friday. I am sure I will have more questions for you then.

Has someone done a shoot-out and published the results? I would assume that CQ has and used those results to select their vendors but I wouldn't expect them to publish their selection rationale.

It seems it would be interesting to people looking for D65 lamps in variant sizes to feel confident in excluding/including low CRI 6500s or including/excluding some the high CRI 6500 specialty lamps (aquarium, reptile, foliage etc).

I have analyzed many more selections than have been discussed thus far. We carry several sizes and types of lamps in our online store as replacement lamps for our past fixtures and DIYs. We no longer offer a T8 fixture due to deteriorating quality control and poor customer service from past suppliers. The T8 lamps are all rated at 6500K and 98 CRI, but we made a decision for our consumer models to switch to T5 fixtures.

What we have now has so many form factor benefits for the current market that we decided a 90 CRI was sufficient. Most of our customers don't have truly neutral walls. The T5 fixtures are lighter, slim enough to fit behind wall mounted TVs, less costly, linkable, more electrically efficient, and easier to ship without breakage.

I would also offer a T8 fixture but have yet to find one that I consider of sufficient quality and low enough cost. Our Pro model is substantially larger and more expensive, but of unparalleled quality, durability and accuracy. It was selected by NIST for their reference video viewing environment.

Hey guys,

Has anyone tried using bias lighting with a pz800 and its THX setting? I am considering bias lighting for my pz800, but I read somewhere that it is not good to use bias lighting behind darker displays, such as experienced with "projection tv." While I know my plasma pz800 is no projection tv, the THX setting of my tv is pretty dark. Has anyone had any experience with using bias lighting with the pz800? Did it improve the THX viewing? Thanks in advance for the help.

The use of bias lighting is not related to picture mode. The amount of bias lighting is related to maximum output.

Of course reductio will get us to a place where bias lighting is of no value but since that's an always black screen we're mostly not interested.

It may not be obvious from the context that you will want to read this article on optimizing your viewing environtment as well as perusing this thread.

Bias lighting would likely not be needed if the peak luminance of the display was limited to around 20 fL or less, occupies at least 26 degrees of horizontal viewing angle in a very dark room, and black levels/contrast ratio are considered satisfactory. THX recommends calibrating free standing TVs to a minimum of 30 fL at 100% white, for viewing in a darkened environment. SMPTE recommends an ideal screen luminance of 35 fL, but no lower than 30 fL, in professional monitor environments. They also recommend bias lighting in such an application. ITU recommends similar circumstances for critical evaluation of HDTV displays.

Thanks for the info guys. I know it has nothing to do with picture settings, but I believe in this case it does with my tv. The THX setting of the pz800 is the best setting on the tv, so it is the one that I use the most. Unfortunately, it also produces the least amount of light output. I am not sure how much light it puts out; however, but I have had it ISF calibrated by Gregg Loewen from Lion AV to achieve the most light output that it can produce.

You should be able to find the peak luminance figure on the calibration report he gave you. Since Gregg is the instructor for the THX Video Calibrator certification course, it's entirely logical to expect that he would leave the TV adjusted for at least 30 fL.

How long have you had the PZ?

The light output was not on the report he gave me.

And...

I have had the tv since October.

Gregg should have the data saved in your file. You could try requesting it from him via e-mail.

FWIW, the maximum light output I measured on my 58" PZ800U in THX mode post-calibration is 35 ftL.