Emergency Power operation is becoming more commonplace,
a few different good ways available to accomplish this
We decided some time ago, to go with 12v/DC battery backup power.
Several Hams spend a lot of time preparing to run their equipment
a blackout. There does not seem to be a lot of information out on
station lighting. We observed normal incandescent or even
lighting can greatly increase the drain of battery backup
A single 5Watt Halogen 12v/DC bulb runs @ 400mA, and produces a lot of
light. This Jumbo LED runs at only @ 40mA, with less light
but still a fair amount. 2 or 3 of these LEDs seems to do the
at this QTH. Enough lighting to work with and a lot less overall
power drain.. The Energy Efficiency of the LED is truly worth
time exploring. Summary information is presented along with our
regarding implementation. Please send us your ides too.
Feb. 24th, 2004, By Steve KB1DIG &
First off. Click on the
below for more close-ups of these 10mm Jumbo LEDs.
Fun stuff! Found these on e-Bay for a little over $1.25 each,
shipping. Included were the 270 Ohm (5% Tolerance) resistors
and even pre-cut sections of shrink tubing. What a deal!
can be a little confusing sometimes, but an interesting place to find
The 8mm or 10mm sizes we found have the same high light intensity
mcd . 9v to 13.8v/DC range with the resistor soldered to the
leg of the diode. In the 3 images above, the positive side of the
diode is on the left. The "positive-side" is called the
The "negative-side" is called the "Cathode". Several others
for LEDs are out there too. Please check with your vendor to
the correct value resistor needed, and the positive or negative side of
the diode, before assembly. For polarity, a simple low-voltage
test will also accomplish this. With diodes the DC voltage will
flow positive to negative. Be careful. These LEDs we used
operate @ 4v/DC-max without the resistor in-line. Over-voltage
One of the biggest benefits of LED lighting:
Unlike normal lightbulbs, LEDs will last thousands and thousands of
Tough little buggers.. They very rarely burn out!
A few different assembly
Should be self explanatory...
Click on the images for larger views.
Some other shots taken. Some
in the dark and gives a rough idea..
Also, click on images below for larger views.
||This was with the camera flash on.
||This was taken in total darkness.
|These were with just 1 LED from an above angle, at
about a 3 foot distance.
Real life was a little brighter than these images.
||Same single LED, about 10 inches away from the surface.
||Single LED now at about 2 feet away..
||Ended up building a new semi-portable 12v/DC station-power
a Type-29 Deep-Cycle Marine Battery. The Kenwood rig is a little
power hungry. Current drain is about 2.5A just in standby
Every mA/h saved means a little more air-time in the long-run....LED
lighting for low current emergency
Hi, You have got a lot of good ideas, so
here is another for your LED
Your 270 ohm resistor is using
more energy than your
LED! If you put 2 LEDs in series, and change the resistor to about 150 ohms or so, you
will use the same current
from your battery and get twice the light. (3 LEDs in series makes the
brightness very sensitive to
the supply voltage, so 2 seems to be the best compromise.) Cost is higher
for 2 LEDs, but twice the
light for no more current is worth it....
web page for viewing items and sending for the catalog is: http://www.cyberguys.com/index.asp
They have several useful lighting options and lots of other neat
the two lighting option I was noting are:
FLEXIBLE LED AUTO LIGHT,
Need an extra light in your car? Plug
LED light into your car’s 12V cigarette lighter socket and illuminate
interior in any direction you want!
• Integrated DC 12V cigarette
• Power-saving bright white LED never
• Includes fuse protection
• Flexible neck holds its
SUPER BRIGHT LED
This super bright
hands free LED
light projects a beam of light in almost any direction! The handy clip
has soft rubber feet to securely grip to just about anything and an
swivel mount provides 360 degree positioning to help you zero in on
• Bulb never needs
• Includes 2 x 3V
• Extra long battery
• Swivel mount points
nearly any direction
• Clip opens to
1-1/4" wide to
clip onto most surfaces
There is also a variety
of USB powered
lamps. 142 0372, 142 0350, and 142 0374 ......
.... I agree with the 12v
or even Anderson powerpole connectors. Enclosures with reflectors would
be an issue. I bought four of those little lights. The two lights seem
to draw 40 to 50 mA. The battery from one company (energizer) is
225 mah...So, at most 9 hours per set of batteries....
Rex G. Carr, M.D.
NHARES EC Southern Grafton
VTARES AEC Windsor County