Posted by Victor Roberts on June 20, 2011, 11:08 pm
There is no need for a sine wave inverter. E-ballasts work just fine
on DC, and most will probably work on square wave input, though I have
not tested this.
sci.engr.lighting Rogues Gallery http://www.langmuir.org
To reply via e-mail:
replace xyz with vdr in the Reply to: address
or use e-mail address listed at the Web site.
This information is provided for educational purposes only.
It may not be used in any publication or posted on any Web
site without written permission.
Posted by Jim Wilkins on June 24, 2011, 2:24 am
I've been experimenting with how little light I really need at a
computer. This laptop has a separate keyboard on a pull-out shelf, lit
by a 10W LED rope light under the desktop. The keyboard has a laptop
layout which makes it narrow enough that the mouse pad fits beside it
on the shelf. It would be poor for numeric entries but otherwise it's
fine for typing in a dark room, like right now.
Posted by Owain on June 20, 2011, 8:28 am
On Jun 19, 11:52pm, The Other Mike wrote:
Night vision glasses?
Or do lots of people have to be able to see? Night vision CCTV camera
and a monitor?
Posted by chrisj.doran%proemail.co.uk on June 20, 2011, 11:56 am
On Jun 19, 11:52pm, The Other Mike
Not cheap, but would these kits, designed to turn an ordinary
fluorescent into an emergency light, do the trick?
Posted by The Other Mike on June 20, 2011, 12:07 pm
On Mon, 20 Jun 2011 04:56:09 -0700 (PDT),
I looked at them a long time ago but it's been suggested that they are
not ideal for external DC supplies as their heatsinking isn't up to
the job. The supplied battery packs have a limited run time 0of a
couple of hours and this isn't enough to 'break' them.
A bit like a computer UPS. Rated at say 1000VA for 10 minutes to get
though short breaks in supply or to enable an orderly shutdown but no
good for long term use 'on battery' Feed them from an external
battery with a higher capacity and they can go into meltdown without
extensive cooling modifications.