From: Sandy King (sanking@clemson.edu)
Date: 12/31/03-09:31:02 PM Z
David wrote:
>I see no reason why they wouldn't work. As I understand it, the main reason
>they are not used so often is that the ballasts are a lot more expensive
>than the standard units.
>
>Regards
>David
I think there is no question but that the VHO tubes will work. The
issue for me is will they shorten exposure times enough to justify
the cost, which are fairly significant since both the tubes and
ballast cost quite a bit more than regular tubes and ballast.
Another issue is total wattage. I am working at this time with a 12
unit bank of 48" normal output BLB tubes, at 40 watts each, for
total of 480 watts. The same unit in VHO design would consume 1380
watts. That is near the limit of modern circuits and may be too much
for some circuits in older homes.
Sandy King
>
>> -----Original Message-----
>> From: Gordon J. Holtslander [mailto:holtsg@duke.usask.ca]
>> Sent: Saturday, 19 October 2002 8:21 a.m.
>> To: alt-photo-process-l@usask.ca
>> Subject: vho bl tubes
>>
>>
>> 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/~fl
>N0YXRlPTM3ODYyNTQ4NTc=?~template=pcat_product_details_document&r3_matnr=0000
>00000000025251&object_id=25251&area=ZGLPRODFLULINBLRS&page=1&price=No+price%
>21
>
>and
>
>http://daeitswp2.mysylvania.com/scripts/wgate/zb2cpcat1ec1733b/~flN0YXRlPTM3
>ODYyNTQ4NTc=?~template=pcat_product_details_document&r3_matnr=00000000000002
>4922&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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