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LED Lighting for Chart Table

LED Lighting

One of my first projects was to provide nighttime LED lighting for the chart table.

Tech Support

Tools & Materials:
  • Wire Strippers
  • Wire Cutters
  • Crimpers
  • Flashlight
  • Screwdrivers
  • Digital Multimeter
  • Pliers
Cost:

If you're just changing a light bulb, expect to pay $4 or $5. Each new complete light fitting could cost up to $50 or more.

When you walk around the boat shows, you see that it's usually the big flashy boats that get all the attention. I enjoy looking at boatbuilders' latest offerings, but when the novelty of looking at boats that I can't afford has worn off, I like to go and visit the smaller booths in search of the latest innovations in electronics and gadgets. I'm always interested in making my boat more fuel efficient and easier to operate, and to this end, I've been looking into reducing the electricity consumption aboard.

LEDs are nothing new. They're comparatively old technology, and they've been used as indicator lamps on TV sets and electrical panels for many years. Scientists have known that the longevity of the LED "bulb" coupled with it's low power consumption would make it an ideal replacement for conventional incandescent bulbs, if only they could produce an LED that delivered a white light and high enough light output. With recent improvements and innovations, these challenges have been largely overcome, and LEDs are now being routinely changed to by owners or are fitted at the factory by the manufacturer.
Dome Light with LED array

Dome-type lights can be easily retrofitted with LED arrays.

LEDs are semiconductors that produce light when supplied with electricity of the correct voltage. Unlike a traditional incandescent bulb, there's no filament, so there's nothing to burn out or break. The most likely failure of an LED is from supplying it with current of the incorrect voltage, which may destroy it. Put your hand anywhere near a tungsten bulb and the heat is immediately apparent; with the filament glowing white hot, it's easy to understand that most of the electricity consumed goes into creating heat rather than light. LEDs give off far less heat.

LED Pros

  • Long life
  • Less electricity 
  • Much less heat
  • Virtually fit-and-forget 

LED Cons

  • Higher Initial Cost
  • May require special fixtures

So Can I Simply Replace My Existing Bulbs With LEDs?

This depends to a large extent on the light fixture. Normally, most reading lamps and those with bayonet-type connectors can be easily exchanged. This is often a good place to start if you're not sure if LEDs are right for you or your boat. I first converted my red and white light over the nav station to LED lighting, then went on from there.
Bayonet-style LED light bulb cluster

Depending on the light fixture, many bayonet-style bulbs can simply be exchanged for an LED cluster, making this the simplest of all upgrades.

Color Temperature

All light, either artificial or naturally occurring, has what is known as a color temperature. This rather misleading term has nothing to do with how hot a bulb gets but refers to the characteristics of the light that it transmits. Color temperature is measured in Kelvin, with 5,600 K being the temperature (color) of daylight at midday.

Any color with a number higher than this appears colder (bluer), while each color with a lower number looks warmer (yellower). Most artificial lights used for reading and other tasks will have a Kelvin rating in the 3,000 to 4,800 range, which represents a good balance between warmth and clarity, and which makes the interior of a cruiser's saloon feel warm and inviting.

Some LED products are labeled with their color temperature. Others are called simply "warm white" because we lay persons think of the yellowish glow of an incandescent light as "warm." Ironically, such LEDs have a color temperature close to that of relatively cool incandescent lights.

Tip From Mark Corke

Use 'warm white' for interior spaces and 'cool white' LED's for exterior lamps.

There is a surprising amount of variation in color temperature available. Your LED lights should last a long time, so if possible, try to see the light in operation before you make a final decision.
Sensibulb from Sailors Solutions

The Sensibulb from Sailors Solutions fits neatly into a variety of light fixtures and offer a good spread of light to read by.

Power Savings

One of the main reasons to change to LEDs is saving power. Although it's difficult to give exact comparisons, a 25-watt 12-volt bulb uses just over 2 amps. An LED light fixture with a similar light output may use between one-fifth and one-tenth of the power. If you add up all the lights on the average cruising boat, your savings can be significant. I have 10 lamps on my boat in the saloon alone. I'm now able to burn all the lights without fear of the house bank getting severely depleted or having to start the generator to keep the batteries topped up.

Factoring In Costs

LED lighting isn't cheap, but you need to factor into the equation that you may never need to change a bulb. Over the life of the boat, the savings both in terms of replacement costs and lower energy bills should more than offset the higher initial outlay. As an example, a 12-diode bayonet-type bulb used as a direct replacement for a 25-watt bulb of the same pattern will cost around $9 versus $2.50 for the standard tungsten-filament version. As more and more consumers and boatbuilders incorporate LEDs, we'll see a further fall in cost.

Mark Corke

A marine surveyor, and holder of RYA Yachtmaster Ocean certification, Mark has built five boats himself — power and sail. He was senior editor of Sail magazine's hands-on "Boatworks" publication, worked for the BBC, written four DIY books, skippered two round-the-world yachts, and holds the Guinness World Record for the fastest there-and-back crossing of the English Channel, in a kayak! He and his wife have a Grand Banks 32.