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Discussion Starter · #1 ·
O.K. Tell me what you know about retrofitting a 500W Lamp into a Dila lamp housing. I have read a couple of mentions about it in other threads, but I can't find where it has been discussed at length. Another Forum member refered to the information as "common knowledge". I must not be common enough http://www.avsforum.com/ubb/smile.gif


Jeff Streitz

Iowa City, IA
 

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Discussion Starter · #2 ·
Here is the best/most information that I have found. It was originally posted by Tryg.


Thanks Tryg!

_______________________________________________________


G10s did use 400w bulb

G10/G11 and G15 use 420w bulb

G20/M20 use 500w bulb


G10/11 have different power supply than G15 on up


400w and 420w bulb are custom builds and proprietary for JVC.

500w is not.


Can you relamp these bulbs in old housing? yes

will they work in G15 or G20? yes


420w = 160 degrees F

500w = 180 degrees F


Can they be purchase for 1/2 the known price yes.


_____________________________________________________


Jeff Streitz

Iowa City, IA




[This message has been edited by Jeffrey (edited 09-14-2001).]
 

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ILC Cermax is now Perkin-Elmer/EG&G. I would look under them. I have some data sheets from the old ILC that I could fax to you, if you can't find Perkin-Elmer.
 

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If it works, it would be somewhat less than the output of the G15 since the optics aren't as good/tuned as in the G11/G15 series.

-=-

Mark
 

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It's also well known that the older G1000's can take the 420 watt bulb. Hope it can take the 500 watt one too!! I've a new 420 Cermax bulb that I will be putting into my old G1000's bulb holder. However since the old bulb still runs, I'm not in a hurry to change bulbs (even for a couple more lumen). Alignment of the bulb in the housing is also an issue.

-=-

Mark
 

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Quote:
Originally posted by Jeffrey:


420w = 160 degrees F

500w = 180 degrees F
The Perkin Elmer site warns that the seals are rated to 150C or much higher than 180F.


Unfortunately the light output is scaling only a bit better than linearly with power. It probably doesn't improve a G1000/G10/G11 output much more than 30%. Not worth fiddling with the power supply, IMO.



------------------

Ken Elliott


[This message has been edited by kelliot (edited 09-15-2001).]
 

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Mark,

Please let us know how Cermax bulb worked for you


------------------

robert
 

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Hi


A bulp that gives 30% extra brightnes, at about half the cost, sure sounds like a good idea to me. The G1000 is a bit old by now, and would not be under warrenty. Of course, if you damage the projector in order to get the new bulp to work, your in trouble http://www.avsforum.com/ubb/smile.gif


How hard would it be to make the changes to the power supply?


------------------

Best regards

Lars
 

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The difference between the 400 watt, the 420 and the

500 watt bulbs are the gap between the electrodes.

Since the projector power supply works on a constant

current principle, a larger gap is a higher voltage

and therefore greater wattage. There is an adjustment

pot on the power supply board that can be adjusted for

power output.


The stock 500 watt bulb works in all projectors. However

the G10 and G11 get significantly hotter when you do

this. The heatsinks on the power supply are smaller

for a start. So if you are going to do this, either

turn down the power pot, or make sure your fans and

filters are kept clean.


As far as replacing the bulb, you should do this

with surgeon's gloves, or silk gloves, because any

finger oil on either the front or side of the bulb

and it will explode. Furthermore you need just the

right amount of thermal grease in the right places.

Too much grease in the wrong place and you cannot

get enough current into the lightbulb. Pure ethyl

alcohol does take the finger prints off.
 

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THANK YOU Kevin. This is exactly the information I was looking for.

-=-

Mark


------------------

JVC G1000 DILA

Stewart Greyhawk

Sony: SAT-B3, DTC-100,STR-DA777ES Receiver

Toshiba: SD-3109 DVD

Proscan 27" TV

B&W: DM601, CC6, DS6B, 800ASW speakers
 

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A few photos and a source for the 500W bulb (by email if necessary, we don't want to loose a perfectly good source!).


Like the power pot, and maybe a photo of the disassembled bulb housing.


------------------

Ken Elliott
 

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Discussion Starter · #14 ·
Thanks Kevin!


Jeff
 

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raugustyn:

I plan on running the current bulb past 1000 hours. I'll take pix of whatever I do though. The bulb I'm putting in is the same bulb as a G11. Many people have put the G11 enclosed bulbs into a G1000 so this is a known scenario. The replacement with a 500 watt bulb is a whole new ballgame. A 420 watt bulb in place of a 400 is just 5% over the original value and many power supplies are overrated by 5-10%.

-=-

Mark
 

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The PE 500W bulb (specsheet) is rated for stable operation over a wide range of powers (340-525W), including 420W.


------------------

Ken Elliott



[This message has been edited by kelliot (edited 09-15-2001).]
 

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By the look of these bulbs it seem like they are sealed if this is true there is a small chance of oil or artifacts getting to the bulb when changing.


Hugo
 

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Kevin,


Can you clarify a bit with regard to the 400W setup in a G10/G1000 ?


Without any adjustment to the power supply, will a 500W lamp work ? Or does the power supply need to be putting out 500W for the new lampt to operate ?


If run at 400W, will the lamp run longer ? Cooler ? Same brightness as the 400W lamp ? Less ?


I understood that most of the difference in lumens 1000 for G10/11 vs. 1500 in the G15 was the light re-polarizer recapturing half the light lost in the simpler G10/G11 lightpath. A G20 uses the 500W lamp, but also has the re-polarizer to get 2000 lumens. Does this mean a 500W lamp in a G10/1000/11 might yield closer to 1200-1300 lumens ?




------------------

*********************

Kirk Ellis

G1000 D-ILA, HTPC, Panamorph (soon I hope),

Dish 6000 (HBOHD,SHOHD,CBS,NBC,ABC,WB,FOX,UPN, KCET -- does it get any better ?)
 

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If you take a 500 watt bulb and put it in a G10/G11 without

adjusting the power pot,it will run at about 440 watts.


If you take a 500 watt bulb and put it in a G15 without

adjusting the power pot it will run at about 470 watts.


Lumens is roughly equal to the power increase. So on a G11

you can expect 10% more light. On a G15 you can expect

12% more light.


If you run a 500 watt lamp at 400 watts, it will be good

for at least 2000 hours.


My camera is at work, so i cannot take pictures, besides

taking my projector down from the ceiling is not

really easy. I can post a bare bulb picture on wednesday.


In any case here is how to find the power pot.

http://gilmore.chem.nwu.edu/jvcg15.gif


The P.C. Adj pot (R323) is about 1 inch from the left

and 2.2 inches from the top of the board.



It should be noted that over 400 volts with about 45 joules

of storage energy are on this board, enough to put you

into cardiac arrest...


[This message has been edited by kevin gilmore (edited 09-16-2001).]
 
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