Note also that there's much difference between the old type sodium lamps and the newer high-pressure vapour ones.
The older type emits light on only two distinct wavelengths, both in the orange part of the spectrum, and can for all practical purposes be considered a monochrome lightsource. The newer type has a somewhat broader spectrum, but still much narrower than eg. fluorescent tubes, halogen lights or tungsten bulbs. The easiest way to tell the two generations of sodium lights apart, is that the older type needs a lot of time to warm up before reaching full light intensity. During warmup, the colour of the bulb change like a sunrise; from dull, almost red to bright, clear orange. Whereas the newer type achieve its final colour almost instantly. Jostein ---------- Original Message ---------------------------------- From: "Jostein" <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] Date: Mon, 27 Jan 2003 11:18:43 +0100 >Hi, Jeff. > >Congrats on your LX. It's _the_ camera for night shots. > >The TTL will not work on Bulb setting. You'll need to use the LX >on Auto for that. > >Floodlights are usually high-pressure sodium lamps. They emit a >rather narrow spectrum which produce an orange/grittybrown/yellow >cast. Colour temperature measurements are not very relevant, since >the spectrum is limited. In my experience, it's wise to bracket >rater widely with this type of lamps. Overexposing will improve >the rendering of other colours, but depending on the distance from >the floodlight, you will of course risk to burn out some highlight >details. > >Jostein > > >---------- Original Message ---------------------------------- >From: "KudzuPatch" <[EMAIL PROTECTED]> >Reply-To: [EMAIL PROTECTED] >Date: Sun, 26 Jan 2003 20:13:50 -0800 > >>First with my new LX (I love saying that!!) am I correct to >assume that the >>TTL flash would still work on Bulb setting? That the flash >exposure would >>be correct? >> >> >>Second. I have for years wanted to photograph this old county >Church at >>night. They have it lit with two big flood lights. I am not sure >what type >>they are but they produce the orangish color light. Anyone know >what color >>temp they are? Or what color I can expect on film? >> >>Jeff <*\\>< >> >> >> >. > > .
