On Thu, 21 Jul 2005 04:46:19 GMT, "James Sweet"
wrote:



If this strip light has a 40-watt ballast it should not be used with
25-watt lamps, as they will have a very short life. If it has a
25-watt ballast, especially an L-C ballast that produces very poor
lamp current crest factor, I recommend you get one with a decent
40-watt ballast.




Every single tube strip light I've seen has a ballast rated for 36-48" tubes
which runs either one at about 25W. They're ok for 36" tubes but worthless
for 48".

You need to look for commercial grade fixtures, such as the
Lithonia S 1 40 120 ES strip light. This is designed for a 4-foot,
34-watt T12 lamp. Grainger lists this fixture for $25.30.

http://www.grainger.com/Grainger/pro...506256&ccitem=

You will notice that the ballast losses are rather high for the
one-lamp EM ballast used in this fixture. I would recommend a fixture
using a 4-foot 32-watt, T8 lamp and matching electronic ballast.

The Lithonia part number would be S 1 32 120 GEB. I don't see this
listed on the Grainger Web site.

--
Vic Roberts
http://www.RobertsResearchInc.com
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