[Housemachine]

As you know I was trying to get more ansi-lumens from ALLY PTV01B. Today I tried to buy an OSRAM Powerball HCI-TS 150/942, however I couldn't find it, and bought Philips CDM-TD 150W/942 Rx7s. (Which is Elken 2004's bulb. You can see his topic in DIY Video Projector Design section.)

Anyway, I've inserted the bulb into ALLY's sexy socket, and shocked with results ! With this lamp, picture was 'significantly' brighter than default bulb, but its color temp. was kind of lower (~4000K due to overdrive, default bulb's color temp. was like ~5000K).

So, if you buy this bulb, you will get a little bit yellowish whites, however you will get '30-40% more ansi-lumens' (I don't have a luxmeter, I'm just assuming). Also with this bulb, colors and dark scenes are way better than default bulb. Especially reds and blues are amazingly well. Btw, this bulb runs cooler than default bulb too. Only disadvantage with this bulb is; slower starting session, and a little bit lower color temp.I think, now everyone can buy ALLY PTV01B or Lumenlab's Projector without any doubt !

In the pictures, screen resolution of projected screen was; 1280x960 pixels (native 800x480). Photos taken with Canon S2 (5MP - auto mode), and cropped with Photoshop (never played with color & brightness values). Size of projected screen was; ~65" diagonal, and room was totally dark. Demo movies downloaded from Microsoft's WMV HDTV page (demo movies were 720P & 1080i), and pictures were downloaded from Caedes.Net... Btw, don't worry about those dark areas of the picture edges, in the real life; there is no dark areas on the projected screen.

I don't want to talk too much, let the pictures talk ...

P.S.: Thanks Elken 2004 to enlighten us .

This post has been edited by Housemachine: 02 September 2006 - 10:11 PM

[Housemachine]

This post has been edited by Housemachine: 02 September 2006 - 07:07 PM

[diresaint]

so where did you get it whats your source?

nice screens btw!

[Housemachine]

diresaint, on Sep 2 2006, 07:01 PM, said:

so where did you get it whats your source?

nice screens btw!

I bought it from a local seller for $37 ( I live in Third World). I'm sure that, you could find it in US and A easily.

[diresaint]

lol you'd be suprised!

[Housemachine]

Yes ...

More pictures:

This post has been edited by Housemachine: 02 September 2006 - 07:15 PM

[Housemachine]

You can see reflections of the light on my bed . It's really bright...

This post has been edited by Housemachine: 02 September 2006 - 07:50 PM

[Mohanned]

Wow, those look quite fantastic. Get we get some more white ones? Is the diffiference in color temp really noticeable? Is it worth getting instead?

[Housemachine]

Mohanned, on Sep 2 2006, 08:15 PM, said:

Wow, those look quite fantastic. Get we get some more white ones? Is the diffiference in color temp really noticeable? Is it worth getting instead?

I will try to take some more pictures (with whites) in few days. Color temp. difference was a little bit noticeable, but not that much in reality. In fact, saturated colors, and superior blacks are absorbing that disadvantage of lower color temperature. It's compeletely worth to buy.

This post has been edited by Housemachine: 02 September 2006 - 08:54 PM

[JoeS.]

What's your throw. How far is the projector from the screen/wall?

[Housemachine]

JoeS., on Sep 2 2006, 09:36 PM, said:

What's your throw. How far is the projector from the screen/wall?

Throw distance was ~2 meters.

[JoeS.]

Housemachine, on Sep 2 2006, 09:41 PM, said:

Throw distance was ~2 meters.

Thanks. Your results look awesome btw!

[leeperry]

hey buddy, nice to see you did it

how many lumens is this bulb supposed to give ? it's like 14000 I think ? so not exactly a 30% improvement over regular OSRAM HQI, which are said to be 11000

is the white perfectly white ?
I don't trust digital cameras as they need to make a white balance and tend to make yellowish white look perfectly white.

and more importantely, you say the dark scenes look great ?
what about matrix 3 ?

I get crispy perfect white with my Venture 6500K light bulb, but dark movies like matrix 3 look like sh*t

[Mohanned]

leeperry, on Sep 2 2006, 06:49 PM, said:

hey buddy, nice to see you did it

how many lumens is this bulb supposed to give ? it's like 14000 I think ? so not exactly a 30% improvement over regular OSRAM HQI, which are said to be 11000

is the white perfectly white ?
I don't trust digital cameras as they need to make a white balance and tend to make yellowish white look perfectly white.

and more importantely, you say the dark scenes look great ?
what about matrix 3 ?

I get crispy perfect white with my Venture 6500K light bulb, but dark movies like matrix 3 look like sh*t

To be honest, I've always been cheating with my PJ. Whenever it's connected to my PC which it always is, I just jack up the gamma/brightness/contrast to something that looks nice - I made a few presets for them - games, movies, dark movies, etc.

You can make your screen SUPER BRIGHT just by adjusting the brightness/contrast/gamma so though I'd like to get more brightness via a bulb, I don't mind cheating if it's cheaper and if I can keep my total white.

[leeperry]

Mohanned, on Sep 3 2006, 02:00 AM, said:

You can make your screen SUPER BRIGHT just by adjusting the brightness/contrast/gamma so though I'd like to get more brightness via a bulb, I don't mind cheating if it's cheaper and if I can keep my total white.

Yes, but this is not the point
HouseMachine and I both have chinese DIY projectors with the same optical elements.

I am well aware that I can increase the brightness to the max, but that's no use.

I get awesome brightness and color temperature with my Venture 6500K 150W RX7s light bulb, and it gives 12300 lumen, but in dark movies like Matrix3 the black is not deep at all, it looks more like dark grey, but that's because of the LCD panet itself I guess..as messing with the panel settings won't help

[Housemachine]

leeperry, on Sep 2 2006, 10:49 PM, said:

hey buddy, nice to see you did it

how many lumens is this bulb supposed to give ? it's like 14000 I think ? so not exactly a 30% improvement over regular OSRAM HQI, which are said to be 11000

is the white perfectly white ?
I don't trust digital cameras as they need to make a white balance and tend to make yellowish white look perfectly white.

and more importantely, you say the dark scenes look great ?
what about matrix 3 ?

I get crispy perfect white with my Venture 6500K light bulb, but dark movies like matrix 3 look like sh*t

Thanks mate. Actually this bulb has smaller arc than default bulb. I mean, it must be giving more improvement than those lumen values of the bulbs (due to smaller arc).

Whites are not that good ( a little bit yellowish ). You're right about digital cameras, I think my camera increases color temp. automatically. In the real life; whites are a little bit different, when I compare with the pictures.

I don't have Matrix 3 at the moment, but I will try to get it, and will inform you.

[elken2004]

adjust your rgb on panel this will fix whites

[Housemachine]

elken2004, on Sep 3 2006, 09:11 AM, said:

adjust your rgb on panel this will fix whites

I was played with the RGB values via ATI Tray Tools, but it wasn't fixed. I think I'm getting more yellowish whites than you, due to overdriven lamp.

[leeperry]

elken2004, on Sep 3 2006, 11:11 AM, said:

adjust your rgb on panel this will fix whites

you can't turn yellowish white into perfect 6500K white

[elken2004]

hate to differ,, but yes you can,,,, at panel level,,, by using personal settings,,, using a greyscale pattern on display,, by achieving proper greys,, I have spent half my life dealing with this kind of setup,,,

software adustment is not the correct point to do it,,, it is used as refinement only,,, if you have ffdshow,, youcan adjust individual colour gamuts..

my lamp is producing perfct whites,, but only after setting panel to correct settings

white text on black is stark and crisp

[elken2004]

sorry to sound curt,, but unless you understand the very basics first, you will be going around in cirlces forever adjusting,,,

primary and formost is setting correct greyscale. then saturation,, oh of course, correct brite and contrast too..

the lamps give unequal amounts of red blue and green irrespective of colour kelvin temps

the 6500 k colour of a lamp is its colour rendition of reflected off of surfaces only,, this does not translate to CF filter on or thru a panel,,, its a misnomer... we only use the RGB components of a lamps emission

different strokes for different folks,, and CFL's used in original monitor panels are different too,, this needs to be understood fully first..

[leeperry]

well, considering perfect white is R:0 G:0 B:0, I wonder how u could turn a 4200K white into 6500K

They eye quickly gets used to CCT and after a while even a 9300K white will look perfectly white to you, but switch back to 6500K and you'll find it so blue

for reference :

This post has been edited by leeperry: 03 September 2006 - 10:35 AM

[leeperry]

elken2004, on Sep 3 2006, 11:59 AM, said:

the 6500 k colour of a lamp is its colour rendition

Well it's the temperature of the light, reason why lamps are rated at specific temps.

So if I got it right, you might even get a 6500K white with a 3000K halogen lamp ?

I don't buy it, sorry

[elken2004]

sorry again,, you have thge wrong view


a lamp is rated at say 6500k,,, you have to relaise thats rated at the total range of emissions as reflected by objects, as per the lamps original purpose in life,,,,, to illuminate objects

it does not transalate to a lamp used as a light sourece where it goes thru three filters being the CF filters in a panel,,, so therefore only those portions of the lamp are used,, which is not equal to the whole lamps rating,,,

we have control at panel level as to what temp so to speak is finally screened,,, I know for a fact that this is lost by most in proper understanding..

if you take only the rgb parts of lamp where it used to 6500k,,, in actual fact you have another temp totally,,

for OUR CRI factor ( projection )to be correct a lamp needs to provide balanced temp ONLY in the RGB portions...

[leeperry]

hummmmmmmmmkay

so what would be THE ultimate bulb according to you ?

I've tried many different types of temps in my life, and nothing comes close to 6500K venture bulbs with my LCD Panel set to 6500K.
ppl have perfectly white shirts, the red are perfect, and the blue too.

even an OSRAM 5200k looks way warmer, and I did fiddle with the OSD settings each time.

This post has been edited by leeperry: 03 September 2006 - 11:08 AM