Switches. I was going to add a dimmer, but have changed my mind.
Graham Collins
Secret Plans
C&C 35-III #11
On 2013-04-05 10:00 AM, Joel Aronson wrote:
Are people adding in-line switches to the LED strips or just switching
them at the breaker?
Joel
35/3
The Office
Annapolis
On Fri, Apr 5, 2013 at 8:45 AM, Michael Brown <m...@tkg.ca
<mailto:m...@tkg.ca>> wrote:
The white 3528 strips work well, good light output and low power.
I have them glued and tie wrapped to a strip of high density foam
board ( about 1/2" wide and 1/4" thick ) that is then screwed in
place. The plastic cover on the strip proved a bit difficult to glue.
Most of the strips have a power rating per meter, the ones I have
are < 4.8 Watts / meter. They are also rated for 12V, but your boat
may have 13.2 to 14.2 volts depending on you charging system. The
LED are fairly sensitive to voltage and could be over driven.
Add a constant current driver, a LED dimmer (also available on eBay)
or a resistor in series. If you expect the highest voltage you will
have on the boat will be 14.5v, then the resistor will need to drop
2.5v at rated current.
The strips I used where a bit under 2/3 of a meter, used about 3.2W
at 12v so required 0.250 amps of current.
To drop 2.5v at 0.250 amps you need a 10 ohm resistor
( Resistance in ohms = Volts / Amps ).
The resistor will need to be rated for 0.625 watts so I used a
1 watt resistor ( about $0.20 from Sayal ).
( Power in Watts = Amps squared * Resistance )
Adding the resistor will dim the LEDs slightly at 12V.
For longer strips where the power to the resistor > 1 watt or
were you want the best lighting power a constant current source
is much better. Simple ones are only four components and cost
less than $10 in parts. The dimmers from China are only $8!
http://madscientisthut.com/wordpress/tag/led-current-control/
Mike
C&C 30
Windburn
> Hi All.
>
> I just volunteered my boat for a test case using these LED strip
lights that are available on ebay cheap out of china. I haven't
seen them used on boats before. They are marketed as being
waterproof. There are a few variations on the LED types with the
two most common being "SMD 5050" and "SMD 3528". The 5050 have
triple LEDs so they can be made into any colour, they are also
brighter because of the triple LED and consume more. The 3528,
which I ordered, are smaller, single cell LEDs and consume less
(why I chose them). Both varieties come in 5 meter lengths for
about $20. The 3528 strip that I ordered has 600 LEDs on it! They
can be cut to size. I purchased these to provide accent lighting
in the cabin. They should be bright enough to be used as a primary
light source for hanging out but not for reading (not the way I'm
installing them, anyway).
>
> For the accent lighting I'll be installing them behind the teak
trim on both sides of the boat just under the cabinets on either
side. They should be hidden from view in there and I will likely
aim them UP into that void rather than down, I'm a big fan of
diffused lighting. I ordered the "natural white 4500k" LEDs. What
I'm hoping to accomplish is a nice subdued ambient light in the
cabin. I might even try a dimmer.
>
> If anyone is interested in this I can update once received and
installed.
> Check them out:
>
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=310638125425&ssPageName=ADME:L:OC:CA:3160
>
> For $20 I figure it's worth the gamble. They are 12V DC so
should be a snap to install.
> I've got other ideas too. I'll see how this first strip works
out and I'm curious to see what the real world power consumption is.
>
> Steve
> C&C 32
> Toronto
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