From: Sandy King (sanking@clemson.edu)
Date: 10/18/02-06:04:51 PM Z
Gordon,
In theory the VHO output 48" tubes, at 115 watts, should print much
faster than regular 48" tubes at 40 watts. However, what I found in
practical tests with 24" Super Actinic tubes, using the same ballast
unit, an Icecap 430 rated for VHO tubes, was that there was very
little if any difference in actual printing speed between VHO tubes
(75 watts at 24") and regular output tubes (20 watts at 24"). I can
not explain why this was the case but I tested several times to
verify the result.
From my experience in testing various UV lights I have concluded that
the ballast is at least as important as the wattage of the tubes so
if you decide to invest in the VHO tubes makes sure that the ballast
units are 1) electronic, and 2) rated for at least 25% more wattage
than the tubes.
Sandy King
>Hi:
>
>I'm planning on building a better UV exposure unit. I looked at
>sylvania's web site and found that they manufacture a VHO BL tube
>an FR48BT12/350BL/VHO/180 a four foot tube.
>
>VHO stands for Very High Output - this usually means a much higher output
>that a standard fourescent tube.
>
>They are a 115 Watt tubes, the standard F40/35 BL tubes are 40 watt.
>
>These have the same spectrum as the Sylvania's F40/350BL.
>
>I'm awaiting prices - they are a special order, as are the
>fixtures/ballasts -the tubes have a different base - a recessed double
>contact.
>
>Has anyone used these? I don't see why they would not work somewhat
>better than a standard F40 BL - can anyone give me a reason why they would
>not work?
>
>The URL's at Sylvania for BL tubes are
>
>http://daeitswp2.mysylvania.com/scripts/wgate/zb2cpcat1ec1733b/~flN0YXRlPTM3ODYyNTQ4NTc=?~template=pcat_product_details_document&r3_matnr=000000000000025251&object_id=25251&area=ZGLPRODFLULINBLRS&page=1&price=No+price%21
>
>and
>
>http://daeitswp2.mysylvania.com/scripts/wgate/zb2cpcat1ec1733b/~flN0YXRlPTM3ODYyNTQ4NTc=?~template=pcat_product_details_document&r3_matnr=000000000000024922&object_id=24922&area=ZGLPRODFLULINBLRS&page=1&price=No+price%21
>
>(Sorry for the long URLs)
>
>Gord
>
>---------------------------------------------------------
>Gordon J. Holtslander Dept. of Biology
>holtsg@duke.usask.ca 112 Science Place
>http://duke.usask.ca/~holtsg University of Saskatchewan
>Tel (306) 966-4433 Saskatoon, Saskatchewan
>Fax (306) 966-4461 Canada S7N 5E2
>---------------------------------------------------------
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