There are two basic types, coated and clear. Color temp varies a bit
between the two, about 200 Kelvin, in the 4000 range. The bulbs are
designed to work vertically, base up OR base down, OR horzontally. Be sure
to get the right one for your fixture. Prices start at around $17 and go
up. Retail on some is over $100. Lycos search.
Respectfully,
Ron Moore

"Ignoramus8325" wrote in message
...
On Wed, 07 Dec 2005 15:29:37 GMT, Pete wrote:
They do not work well with the bulb straight up ( base down) and the
light
deteriorates with age and usage.You should have about the same as 1000
watt
incandesant bulb for a mid life MH bulb of 250 watts.

I see. The bulb in my test was placed horizontally. So, you basically
suggest to get a new bulb, right? If so, what kind?

thanks