March 2006 Alt-Photo-Process-L: RE: old UV tubes less contrast?

From: Loris Medici ^lt;mail@loris.medici.name>
Date: 03/03/06-02:18:11 AM Z
Message-id: <001f01c63e9b$04a0fc30$f402500a@altinyildiz.boyner>

Well, the lamps I use (Philips TLK40W/05; emission between 300 - 460nm,
peaks @ 365nm) are rated 2000 hours. It's better to be on the safe
side...

Regards,
Loris.

-----Original Message-----
From: Judy Seigel [mailto:jseigel@panix.com]
Sent: 02 Mart 2006 Perşembe 22:56
To: alt-photo-process-l@sask.usask.ca
Subject: Re: old UV tubes less contrast?

If the bulbs are facing up, you might try dusting them. At least around
here, a coating accumulates. It's also true that bulbs are *brighter*
when quite new, tho that soon tapers off. And, as I recall, the rated
life of the bulb is circa 9 to 12,000 hours, no?

Plus, did you change anything in the vicinity? Reflection counts.

J.
Received on Fri Mar 3 02:12:35 2006