🚀 go-pugleaf

In article <qKrca.13204$jE3.329980@news.xtra.co.nz>, Ken Taylor
<ken123@xtra.co.nz> writes
>"DaveC" <anon@bugus.net> wrote in message
>news:0001HW.BA977EAD001869E90E6B7920@news.covad.net...
>> I've been asked to help light a small office building hallway. The
>> fluorescent lamps are way too harsh for the office workers, and the
>tenants
>> favor the overhead QH approach.
>>
>> I've looked at the local home centers' lighting departments and see quite
>a
>> selection of LV systems using overhead steel cable with 3 hanging
>reflector
>> bulbs (with a choice of trim, or not) tapped in at appropriate intervals.
>>
>> Price for the above from $70-100us.
>>
>> Being encouraged by what I saw, I decided to see what I could build from
>> scratch.
>>
>> As you probably can guess, I'm running into current supply/demand
>> limitations. Each of the 2 hallways could use about 15 lamps. Lamps are
>> available in 20 and 50w versions, which at 12v, draw approximately 1.7a
>and
>> 4.2a, respectively. I now see why the cost of such a system is mostly for
>the
>> supply.
>>
>> Looking for a ready-made 12v supply, I find this at Jameco for $70us that
>> provides 12.5a:
>>
>> <http://www.jameco.com/cgi-
>>
>bin/ncommerce3/ExecMacro/Jameco/searchResult.d2w/report?sort=BPA&search=1234
>22
>> >
>>
>> This would allow me to run 7 of the 20w lamps, or only 2 of the 50w lamps.
>>
>> I can't see buying 2 supplies to run the 15 (well, I guess we could rev
>that
>> to 14) lamps in each hall. I seem to be butting up against Ohm's Law.
>>
>> Maybe build a simple, unreg'd, analog power supply with massive
>transformer
>> and rectifiers for 30A?
>>
>> Any other ideas (or links to sites) to help me reach a solution would be
>> greatly appreciated.
>>
>> Thanks,
>> --
>> Dave C
>> dave+usenet3016@mailblocks.net
>>
>
>Anything you build will, of course, be certified as meeting standards?
>
>
>
The dedicated LV supplies are cheapest. Lamps easiest to run on AC!
Electronic transformers are smallest but mine overheat if above lamps
and long LV cables radiate medium wave interference cant imagine how
they pass regulations. Best buy in UK is individual potted torroids for
each lamp cylindrical so they fit in lamp cavity.

-- 
ddwyer