Lamp for Samsung HL-R5667W - Defective?
I replaced a Philips lamp (BP96-01073A(P)) in my TV(purchased 2005). It was losing light output and it had to cool for 45 minutes before the TV would restart.
The color was way off with the new OSRAM bulb. On faces, most often a blotchy yellowish area was on the forehead. In darker scenes, there were severe green blotches surrounding areas and blue blotches also. Some brighter scenes looked normal.
After adjusting the set frequently for about a month, I was seriously thinking about buying a new TV! I put the old bulb back in. The color was back to normal with the old bulb.
I had stored the bulb and it was out of warranty but I contacted the retailer anyway. They are saying that 'it could not possibly be the lamp as the lamp only supplies light and does not affect the color'.
I am researching high pressure mercury lamps and have found -
I have worked with light sources and their spectral outputs although I'm not familiar with these specific lamps. Generally, a gas such as mercury is used. At low pressure the lamps produce line spectra, strong green lines, blue lines, etc. such as those shown on the following site. The lower the pressure the sharper the lines will be. Compare low and high pressure mercury spectra on this site.http://ioannis.virtualcomposer2000.c...oscope/Hg.html
To get a very broad spectral output, blue to red, the pressure can be increased to a very high level. The lines broadens and the spectrum fills out to look more continuous, more like sunlight. I believe the quartz tube at the center of the lamp is very thick to hold the high pressure.http://www.projectorlampexperts.com/...facturers.aspx
"Osram projector lamps
Osram's P-VIP lamps are high pressure mercury lamps for use in video projectors, rear projection televisions and other projection applications. The spectrum of mercury in these lamps is altered by the high operating pressure, resulting in a dense, multi-line spectrum which is ideal for projection purposes.
Osram lamps give a high luminance, an essential prerequisite for efficient projection devices. Furthermore they excel through long operating life and a low loss of luminous flux during that life span."
If a lamp is defective and loses pressure the spectrum would tend to show more line structure and that should appear in the picture. In fact, the strongest line of the mercury spectrum is the green line as can be seen in the first link. That strong green line might account for why green seems more prevalent in my picture with only the one bulb. ?
Switching bulbs is a simple experiment. The old Phillips bulb produces good colors and the replacement OSRAM does not.
I’d like your thoughts on whether defective lamps can produce this type of color effects and, in general - what is going on?
Also, after turning the set off it requires 45 minutes to cool before it can be restarted. Is there a temperature sensor that needs to be cleaned? Where?