Re: Bias Light
|
Joined: Sep 2004
Posts: 11,458
shareholder in the making
|
shareholder in the making
Joined: Sep 2004
Posts: 11,458 |
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
|
|
|
Re: Bias Light
|
Joined: Feb 2009
Posts: 3,466
connoisseur
|
OP
connoisseur
Joined: Feb 2009
Posts: 3,466 |
It was Phillips, and they called it Ambilight. And you're right, they missed the point. The color and intensity varied with what was on screen. So it couldn't provide a reference at all.
Pioneer PDP-5020FD, Marantz SR6011 Axiom M5HP, VP160HP, QS8 Sony PS4, surround backs -Chris
|
|
|
Re: Bias Light
|
Joined: Jun 2003
Posts: 8,488
axiomite
|
axiomite
Joined: Jun 2003
Posts: 8,488 |
Very interesting, Chris. Thank you so much.
We have a 61" JVC HD-ILA RPTV. We always have some ambient light on in the back of the room; it helps a lot. Since the lights are small, halogen pucks firing at the white, cathedral ceiling, there is no glare on the TV.
I'm curious about how the color of the wall behind the TV might affect this concept. Painting the interior of our house is slowly working its way up the list, and I had been thinking of going "dark" behind the TV, but your post is making me rethink that.
bibere usque ad hilaritatem
|
|
|
Re: Bias Light
|
Joined: Jul 2004
Posts: 1,443
connoisseur
|
connoisseur
Joined: Jul 2004
Posts: 1,443 |
SO.....if we just went standard, are we talking 25w, 40w, 60w....?
"A fanatic is someone who can't change his mind and won't change the subject" Churchill
|
|
|
Re: Bias Light
|
Joined: May 2004
Posts: 1,201
connoisseur
|
connoisseur
Joined: May 2004
Posts: 1,201 |
SO.....if we just went standard, are we talking 25w, 40w, 60w....? 1.21 Gigawatts.
*Michael* AV123 Refugee - X-LS Encore, X-Voce, X-Omnis, Elt-Dpa's Denon AVR-591 Magnavox NB500MGX BDP
|
|
|
Re: Bias Light
|
Joined: Feb 2009
Posts: 3,466
connoisseur
|
OP
connoisseur
Joined: Feb 2009
Posts: 3,466 |
SO.....if we just went standard, are we talking 25w, 40w, 60w....? You don't want an incandescent bulb for this. Their color temp is way too low, it'll bias your eyes to make everything appear blue on the screen. You need a "daylight" bulb, the closer to 6500K (which is what the color temp of your display should be set to also) the better. As for lumens, it varies based on the distance to the wall. If you have any DVD/BD with test patterns look at the 15% gray, that's how bright the wall should appear behind the TV. That is one nice thing about the Ideal-Lume Pro, it has a dimmer so I could dial it in exactly. Is that worth the 500% increase in price over the standard? No.
Pioneer PDP-5020FD, Marantz SR6011 Axiom M5HP, VP160HP, QS8 Sony PS4, surround backs -Chris
|
|
|
Re: Bias Light
|
Joined: Jul 2004
Posts: 1,443
connoisseur
|
connoisseur
Joined: Jul 2004
Posts: 1,443 |
Excuse my ignorance - so would one of the Fluorescent bulbs - low wattage (for lack of a better term) in one of the configs like "Daylight" aiming at 6500K is what I am getting out of this?
"A fanatic is someone who can't change his mind and won't change the subject" Churchill
|
|
|
Re: Bias Light
|
Joined: Feb 2009
Posts: 3,466
connoisseur
|
OP
connoisseur
Joined: Feb 2009
Posts: 3,466 |
There's two things which determine the quality of a light source that's claiming to be "daylight". First the color temp, daylight falls in the 6500K range, and that's exactly the number you want for a video display. The other is CRI (Color Rendition Index), the sun gets a CRI of 100, because that's the reference. It's basically a measure of how complete the spectrum produced by the bulb is. Good bulbs are just above 90, excellent in the mid-90s, and crazy expensive in the high-90s. If you can find a low-lumen, fluorescent bulb with a color temp of 6500K, and a CRI over 90, you'd be in good shape. If you just want to get an idea of what the light would bring to your display, go with any daylight CFL. But at $60 for a 10,000 hour bulb, plus fixture, the Ideal-Lume Standard is a great deal.
Pioneer PDP-5020FD, Marantz SR6011 Axiom M5HP, VP160HP, QS8 Sony PS4, surround backs -Chris
|
|
|
Re: Bias Light
|
Joined: Jul 2004
Posts: 1,443
connoisseur
|
connoisseur
Joined: Jul 2004
Posts: 1,443 |
Thanks. I knew I would learn something today - did not know about the CRI..........Rob
"A fanatic is someone who can't change his mind and won't change the subject" Churchill
|
|
|
Re: Bias Light
|
Joined: Feb 2009
Posts: 3,466
connoisseur
|
OP
connoisseur
Joined: Feb 2009
Posts: 3,466 |
The problem with using an excited phosphorescent material for a light source is that it isn't black-body radiation, but rather conforms to a more coherent spectrum. So florescent lights trying to mimic white light will use several different materials in the coating, each with a different spectral center. The overlapping spectra produce something closer to "white" light.
Cheap bulbs will use 2 or 3 phosphors and produce a very poor, tinted light (sub 90 CRI). At 5 different phosphors florescent bulbs take on a different character and become very high quality light sources (94+ CRI). At 7 (96 CRI), they best everything but the $1500 filtered tungsten halogen-cycle bulbs.
Pioneer PDP-5020FD, Marantz SR6011 Axiom M5HP, VP160HP, QS8 Sony PS4, surround backs -Chris
|
|
|
Forums16
Topics24,946
Posts442,494
Members15,617
|
Most Online2,082 Jan 22nd, 2020
|
|
0 members (),
832
guests, and
3
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
|
|