... i found this
bulb with a color temp of 3065k
54807_1 - OSRAM 575W 115V HPL Long Life 3065k G9.5 Halogen Light Bulb for $16.28
our
current lamp is this one with a color temp of 3265k
54622 - OSRAM SYLVANIA HPL 575w 115v Heat Sink Halogen light bulb for $20.95
would the color temp difference be noticeable if i started replacing the bad lamps with these, by eye, or video?
Perhaps more important than difference in
color temperature is the output--Luminous Flux (measured in
lumen s). In this comparison: 12,360 vs. 16,520 lumens. Both the camera and the eye WILL detect the lamp that is one-third brighter at the same
dimmer setting. So you may find that you have to run the 300-hour lamp ~20% lower than the 2000-hour lamp to get them to match in
intensity, which may result in them having about the same
color temperature, and about the same life expectancy. Putting you right back where you started.
P.S. It pays to shop around. I thought it slightly odd that the particular vendor you cited charges a >$4 premium for the standard vs. long-life lamp. I found this:
OS HPL575/X 115V #54807 | OSRAM SYLVANIA | Halogen $18.45
OS HPL575 115V #54622 | OSRAM SYLVANIA | Halogen $18.82
It averages out the same, but depending on which lamp you choose, the savings can add up.
These two vendors may be the two largest volume suppliers on the Internet, but also don't neglect your local vendor, see
Dealers for Supplies and Equipment - ControlBooth . A local vendor may meet or
beat an Internet price, or he may tell you he simply can't compete--good to know either way. Lamp prices can vary daily like the price of gold or any other commodity. Also, there are both foreign and domestic manufacturers, and the value of the US dollar can further complicate pricing. I believe Osram-Sylvania, GE, Philips, Ushio, and Wiko are the major manufacturers of
HPL lamps. I'd avoid all other brands if possible. If you were a school, I'd say to check with your district's purchasing agent, as they may have a negotiated or government bid arrangement with a particular vendor in order to achieve the lowest costs.
Good luck, JonG, and be sure to report back here with your research and experiences.