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Old 01-14-2009
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Originally Posted by noelex77 View Post
LEDs produce heat and unfortunately the heat is produced at the back of the diode rather than projected out like incandescent s. Heat build up is one of the common causes of LED failure. Many LED light sources require heatsinking to work when the equivalent light output from a conventional globe would not require a heatsink.
The LED globes used as replacements in masthead lights take the heat generation of the LEDs into account and are safe for the masthead fitting, but if designing an LED light fitting from scratch heat dissipation is one of the problems the manufacturer has to overcome for long life and high output.
LEDs do produce heat. However, NOT as much as incandescent lamps do.

Note that almost EVERY visible radiation light emitting diode made does NOT have a heat sink either (except laser diodes). A very few bright LEDs have some sort of heat sink.

As Noelex states if the design is properly accomplished the heat is taken into account and the LEDs will last for hundreds of thousands of hours, probably longer than most of you will own a boat. On the other hand, LEDs DO fail on occasion.
Rick Donaldson, NØNJY

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Old 01-14-2009
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Leds produce less heat per lumen than incandescent lamps, but the heat build up in the light fitting tends to be higher. This is why even cheap LED torches are often aluminium. The aluminium casing acts as a heatsink for the emmiters.
LED diodes do not have a heatsink in the raw component stage even emmiters that would only last a few seconds without any heatsink.
When mounted however they require careful consideration of how the excess heat is removed. Sometimes this is accomplished by driving the LED at low current levels, but more efficient heatsinking allows for much higher light outputs. This is why so many LED torches and purpose designed masthead lights like Lopolights are aluminium.
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Old 01-31-2009
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We've replaced our anchor, tricolor, spreader and running lights a couple of years ago with Dr LED bulbs and have been very pleased.

Inside we've gone to Sensibulb and Dr LED but a friend showed us a light that was a lot brighter than ours. I'll need to email him for the brand (Marine Bright?).

We also use a couple of Bebi lights to light up the boat at anchor for safety reasons.

We spend a lot of time on the hook and consider the LED's to be crucial for battery management.

s/v Grace PSC34#163
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Old 02-02-2009
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Anyone know the style of bulb in the tricolor light fixture?
I'd sure like to have the bulb in hand when I go up there to replace it.
Am very interested in using these Dr. LED's which look to be well thought out.
My tricolor is the model used on the 1988 PSC 34.
Thanks all!

PSC 34
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Old 05-25-2009
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I thought I had read an article somewhere that suggested if you switch to LED's you needed to reduce the fuses on the lines as any short was not quickly picked up due to low wattage by old circuit breakers. I believe article was referencing a home electrical system rather than a marine application. I know nothing about electrical systems so perhaps a more informed person could respond.

I didn't buy the heat issue as a reason to avoid LED's either.
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Old 05-25-2009
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LED lamps do produce significant heat but as has been mentioned it's not from their light output but internally. We use a lot of strip LED lighting in our business and know that it is wise to mount them on a thin aluminium extrusion in order to help dissipate the heat.

The highest output LEDS that we use to replace dichroic halogen lamps (MR16s) all have large heat sinks behind the pins. Testing we have done on LED lamps without the heat sink has shown significant failure rate far below projected lamplife.
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Old 05-26-2009
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Wombat-san - do LEDs that use a Buck Converter still produce much heat at nominal 12-13V voltage? The ones on my boat seem remain cool to the touch (unlike their predecessors, which had resistors) when I use them; but they are somewhat pricey ones.

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Old 08-18-2009
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I've replaced my all my internal lights, the mast head and tri-colour with LED's from Jeff at Replacement LED bulbs for your existing boat fixtures and was very pleased. Had the mast lights switched on while I was up top as I didn't fancy two trips up a day, they worked perfectly and no noticeable heat problems, there is a lot of space for cooling.

The internal lights are high output 120 lumen "light hammers" and they certainly get warm, they do have a heat sink, but are much cooler than the 10w power hungry halogens they replace.

No affiliation with the Company other than being a pleased customer.

Who thought it was a good idea to put halogens on yachts ? fluorescent is a much better, more battery friendly solution, but LED technology seems to be moving at such a pace hopefully halogen bulbs will be one for yacht design history.

Last edited by wilko; 08-18-2009 at 12:16 AM.
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