In inspiration by you people I bought an old Infocus LP 335 with a 120 W (almost) dead bulb. Next buy was a 6000 K 150 W HQI with an arc length of ~20 mm. My idea was to use the existing ballast together with the new burner and using the old reflector.
First thing I did was wire the new bulb to the projector and try to light it up with the original ballast. To my joy everything was working fine and I let it run for 15 min. A nice blue-ish tone filled the room (together with the smell of ozone).
I then replaced the burner in the original reflector with the HQI burner and mounted it in the projector and pushed the power button. The bulb comes on and the infocus welcome screen is projected but soon after the projector goes down. The bulb is lit ~20 s before the projectors shuts itself down. I repeated this 3 times before I gave up.
I took the cage holding the bulb out of the projector but still wired to the projector. In this setup the projector stays on without any issues (tried it twice).
What could be causing the projector to reject the bulb from being lit inside the projector? Heat, but in 20 s how much heat can be built up? Any ideas are welcome.
If any of you have a copy of Infocus LP335, or similar, service manual you would like to share I would appreciate it.
First thing I did was wire the new bulb to the projector and try to light it up with the original ballast. To my joy everything was working fine and I let it run for 15 min. A nice blue-ish tone filled the room (together with the smell of ozone).
I then replaced the burner in the original reflector with the HQI burner and mounted it in the projector and pushed the power button. The bulb comes on and the infocus welcome screen is projected but soon after the projector goes down. The bulb is lit ~20 s before the projectors shuts itself down. I repeated this 3 times before I gave up.
I took the cage holding the bulb out of the projector but still wired to the projector. In this setup the projector stays on without any issues (tried it twice).
What could be causing the projector to reject the bulb from being lit inside the projector? Heat, but in 20 s how much heat can be built up? Any ideas are welcome.
If any of you have a copy of Infocus LP335, or similar, service manual you would like to share I would appreciate it.
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Look into HID's the arc is much smaller. With a DLP the light needs to be focused to about a 3/4 inch circle about 1/2 an inch from the infared filter on the front of the lamp cage. This will ensure the light tunel gets full illimination. Without focusing the light the image will be super dim as all ur getting is the light from the front side of the lamp. The rest is just adding heat. Play around with focusing. I will post some images of my dlp mod.
there is a glass bar in the light-way, about 7*7mm, the light can not be used if it is bigger more than 7*7mm. but the HQI is not a small dot. so most light can not be used
You are right crazifunguy, the arc length is a bit on the long side and light output will not be as good as it could be with a better suited burner. I know my approach is not the best but I am curious of how the result will be and the bulb did not cost a fortune, not to mention the valuable experience I get when experimenting. Your work in bypassing ballasts might be very helpful later on if I go for a power LED instead.
and thank you ywh, for all your good work.
Anyway, before I started cutting out the old burner I did light it up outside the projector, but still inside the reflector to get an idea of where focus should be located for later comparison. I also put a piece of cardboard at focus and the new burner with reflector burns the paper a lot faster than the old and dim original did. I do expect the results to be better than the old worn out bulb despite wasting most of the light. Too bad that the current setup does not work inside the projector. Next step is to try to cover the thermo switch and see if it is the culprit.
Merry Christmas to you, if applicable.
and thank you ywh, for all your good work.
Anyway, before I started cutting out the old burner I did light it up outside the projector, but still inside the reflector to get an idea of where focus should be located for later comparison. I also put a piece of cardboard at focus and the new burner with reflector burns the paper a lot faster than the old and dim original did. I do expect the results to be better than the old worn out bulb despite wasting most of the light. Too bad that the current setup does not work inside the projector. Next step is to try to cover the thermo switch and see if it is the culprit.
Merry Christmas to you, if applicable.
ywh: going from 2.5 mm to 1.3 mm arc length makes that of difference. In that case my light output is what to be expected... Maybe then I go for a P7 led instead.
I forced the lamp signal to indicate a lit lamp and now the projector stays on (I suspect the new bulb taking a bit longer time to warm up causing the projector to think the bulb did not strike properly). Too bad are the colors all mixed up. Is the new bulb so off in colors that the color wheel can't sync correctly?
(The thin vertical stripes in the image belong to the wallpaper)
I forced the lamp signal to indicate a lit lamp and now the projector stays on (I suspect the new bulb taking a bit longer time to warm up causing the projector to think the bulb did not strike properly). Too bad are the colors all mixed up. Is the new bulb so off in colors that the color wheel can't sync correctly?
(The thin vertical stripes in the image belong to the wallpaper)
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The color temperature is means the color of temperature , no high temperature no high color . you broken the shell, lost temperature by the win .
ywh: By removing the outer shell and thereby exposing the burner to circulating air, the temperature goes down and the temperature drop affects the color distribution, e.g. towards green as is in the picture above?
And in other words; even if I got the projector to sync there is no point in continuing with this bulb since the colors would still be way off (and beyond the help of adjustments of the gamma curves).
And in other words; even if I got the projector to sync there is no point in continuing with this bulb since the colors would still be way off (and beyond the help of adjustments of the gamma curves).
I had another go with the projector. Tilting the projector temporarily fixed the sync problem. Although not being a permanent fix. It is probably the cooling that affects the distribution of colors which in turn causes the sync error. As soon as the fans starts the colors get distorted.
I applied color filters, made up of transparent plastic strips painted in different colors, in front of the color/sync sensor. Red cured the sync error, but the colors where not as good as they would get by tilting the projector.
Besides I have located two hot spots inside the projector where the plastics have melted due to the new bulb. In some places the lack of heat causes problem and in other places excessive heat is the problem, it is never satisfied...
The light output was a bit dim but if had no other option (another better projector) I would probably have used it to some extent.
Two D binned P7 LEDs are on its way and that is where I continue.
I applied color filters, made up of transparent plastic strips painted in different colors, in front of the color/sync sensor. Red cured the sync error, but the colors where not as good as they would get by tilting the projector.
Besides I have located two hot spots inside the projector where the plastics have melted due to the new bulb. In some places the lack of heat causes problem and in other places excessive heat is the problem, it is never satisfied...
The light output was a bit dim but if had no other option (another better projector) I would probably have used it to some extent.
Two D binned P7 LEDs are on its way and that is where I continue.
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