Posted by Don Klipstein on June 20, 2011, 9:02 pm
I would replace the 5-footers with 4-footers. More 4-footers are made
than all other sizes of fluoros combined. Going with the flow will
greatly improve your ballast choices.
- Don Klipstein (email@example.com)
Posted by Andrew Gabriel on June 21, 2011, 9:04 pm
Don@DonKlipstein.com (Don Klipstein) writes:
Whilst that is likely in the US (I'm always somewhat surprised to see
large US supermarket lit with rows and rows of 4' T12 tubes), it's not true
here. 4' was a popular size in the home in the 1960's, but in supermarkets
and other similar installations, they tend to be 5', 6' or 8' tubes (8' is
becoming rarer now), but never 4', possibly because of their low loading
compared with the longer tubes.
In offices, you can find 4' tubes in 1200x600mm modular ceiling lights,
but 2' tubes in 600x600mm modular ceiling lights are much more common.
(These are giving way to externally ballasted compact fluorescents now.)
[email address is not usable -- followup in the newsgroup]
Posted by Victor Roberts on June 20, 2011, 11:02 pm
On Sun, 19 Jun 2011 23:52:29 +0100, The Other Mike
I agree with Andrew about DC input. Most electronic ballasts will
work rather well on DC input power, and many ballast manufacturers
even rate then for DC input. So, you can either recondigure your
battery pack for high DC voltage (which I understand you do not want
to do); or try the electronic ballasts on the square wave output,
which they may like just fine; or rectify the square wave output to
produce DC and feed the ballasts with that.
sci.engr.lighting Rogues Gallery http://www.langmuir.org
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Posted by Dave Plowman (News) on June 22, 2011, 11:11 pm
My feeling is that magnetic ballast mains florries fed via an inverter
would be very little more efficient than 12 volt halogen lighting.
*Save a tree, eat a beaver*
Dave Plowman firstname.lastname@example.org London SW
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Posted by Tabby on June 23, 2011, 12:51 am
electronic invertors get over 90% efficiency, the difference between
the 2 is huge