http://store.marinebeam.com/dc-dc-converter.html
Dennis C. Sent from my iPhone On Jun 28, 2013, at 9:31 AM, bria...@aol.com wrote: > > One other thing... when my batteries were charging on the charger after I'd > been away from the boat for a month, the voltage initially approached 14.2 > volts. Before I used the buck converters, I measured the temperature of the > LEDs with a temperature probe in contact with an LED. It approached 182 > degrees F, much to hot. This temperature will dramatically shorten the LEDs > life, or cause damage to the circuitry built into the strips, causing > premature failure. > > After installing the buck converters, the LED temperature (after being on > for 1/2 hour) was in the 100-110 degrees F range as best I recall. Ambient > temperature in both cases was about 80 degrees F, and these are high-output > LEDs. > > Part of the problem with these strips is that they cannot/do not have > effective heat sinks to dissipate high temperatures. This is even more of a > factor with the newer higher-output LEDs being used. > > Bill > > MYSTY > Landfall 39 > From: bria...@aol.com > To: cnc-list@cnc-list.com > Sent: 6/28/2013 8:13:29 A.M. Eastern Daylight Time > Subj: Re: Stus-List LED cabin lights > > Rich, > > I replaced all the recessed light fixtures on MYSTY with LED's that I > made, using the cleaned-up carcasses of the original fluorescents, some very > bright double-wide LED strips, and buck voltage converters. > > I used buck converters (that's really what they're called) that I found on > eBay. They serve the same function as the devices your link describes. I > bought 5 at a time, and paid approximately US$10 for all, including shipping > from China. > > I then, using an adjustable DC power supply, connected the completed > converted lights and set the converters. I set the converter output to 12 > volts when the input voltage is 15.0. The net result is slightly less light > output at voltages lower than 15.0, but the LEDs are protected should the > voltage go that high. > > Only one issue to be aware of. The converters DO NOT tolerate being connected > with "+" and "-" inputs reversed. Don't ask how I know.... > > Bill > > MYSTY > Landfall 39 > > > > > > In a message dated 6/28/2013 7:31:03 A.M. Eastern Daylight Time, > r...@sailpower.ca writes: > http://dx.com/p/car-150w-dc-8-32v-to-9-46v-voltage-boost-converter-regulator-for-laptop-blue-206971?utm_rid=95527470%2C95527470&utm_source=shopping&utm_medium=pcs&utm_campaign=paidshopping > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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