Extra Anchor Lighting

When summer comes, a dozen or more sparkling white lights will adorn every popular anchorage. Visible from miles away, they promise to provide good warning to approaching boats that something is anchored there. In practice, they have manifold shortcomings. They all look alike, distance is impossible to gauge, and they can be difficult to distinguish from stars and shore lights. Fast-moving dinghies and runabouts often overlook them, since they are far above the driver’s sight line.

The basic rules for anchor lights were written in 1846-1850. The United Kingdom led with the Steam Navigation Act of 1846, and the U.S. followed soon after. Electric lamps had not been invented, confusion with background lights was a minor concern, and a single lantern was considered enough. But is it now?

COLREGS states in Rule 5 (long before we get to the description of lights in Rule 30) that we must maintain a watch. There is no exemption for smaller vessels or while at anchor. Since this is impractical for the cruising sailor, and because nighttime harbor collisions are unfortunately common, taking additional steps in the form of supplemental lighting seems prudent.

Observations

When entering a harbor or any area that might have anchored boats, watch out for a relatively bright star that is moving in relation to the others. That’s a mast light indicating a boat. And if you are approaching that boat, the motion will be even less obvious. Once you learn how difficult this can be on a moonless night, you will understand our call for supplemental lighting.

Our opinion is that anchoring in an active harbor requires lighting both high and low. A masthead anchor light can be lost in the cloud of anchor lights and stars. An anchor light placed lower can be lost against the background of street lights and porch lights. So while the lower light could be a second anchor light product—COLREGS 30 (a) says it can be—an area light may better serve the purpose by illuminating the deck and super structure. COLREGS 30 (b) says you may display additional work lights, and we think you should.

A powerful spreader-mounted deck light may be too much, disturbing your neighbors. In principle they are focused downward, but some light up the whole harbor.

Like Moths to a Flame

Cabin lights generally impart a glow to the whole boat, making the outline clear, but you can’t sleep with them on. Allowing for tinting and curtains, they are generally visible for only ¼- to ½-mile, depending on intensity. Cockpit lights draw mosquitoes to the companionway; if you leave cabin lights or the cockpit light on and go to shore for dinner, you may return to a cabin full of the pests. Put the screens in before you leave. Sometimes we set a light on the pulpit to draw them away from the companionway.

LED Radio Interference

Don’t forget radio interference. LEDs require current regulation, which is most often accomplished by a combination of resistors and rapid switching of the power using transistors. If the voltage drop is sufficient, this will cause radio frequency interference. Most interference is contained within the boat’s own power system, where it interferes with your radio and instruments, but it can also radiate a short distance.

Lights that show an FCC or USCG approval have been tested for radio frequency interference (RFI). In our testing, the RFI of low-voltage solar lights, which lack the approval of either agency, are too low to be a problem. At a minimum, scan that full range of VHF frequencies after installing any new lighting.

No flashing or strobe lights, please. This is reserved for signaling distress and can annoy your neighbors.

Solar Pathway Lights

Designed for lighting footpaths ashore, these cheap lights intrigued us. Most solar pathway lights claim 8-hour run time, but all the ones we have used go dim after 4-6 hours and wink out well before first light. The solar panels are really tiny. Although they require only a few watt-hours to recharge the battery, they need at least 4-6 hours of full sun for best results.

Units we tested in broken shade usually fully recharged, but those in deep shade often winked out hours earlier. Likewise, overcast and rainy days can slightly reduce run time.

Swapping the factory NiCads (0.600 Ah) for lithium rechargeables (2.3 Ah) seemed like a good idea. Fully charged, they kept the lights on for two nights, but then failed to recharge because they require a higher charging voltage than the factory NiCads, more than the solar panel puts out. Also note that not all lithium batteries are rechargeable, and not all lithium rechargeables are 1.5 V (some are 3.2 V).

Don’t Overdo It

Decorative lighting and strips can obscure your functional navigations lights. Observe your boat from all directions with all the lights on. Are the basic navigation lights clearly visible and the course of the boat obvious? Any supplemental or decorative lights that could interfere with clear recognition of your functional navigation lights must be turned off when underway.

Boats on moorings. For moored boats, we’d install enough built-in solar panels to run a conventional masthead anchor light through the main battery system.

Although there are photocell systems that will turn lights off during the day, a low-draw LED anchor light draws little more than the sensing circuit, so you can just leave it on. We don’t fully trust the durability of any of the solar pathway lights, so we would install one additional anchor light down low, with a separate switch.

For anchoring while aboard, or for a short hiatus away from the boat, a few of the Hampton Bay Silver Pathway Lights should make your boat easy to find and will make it more visible.

Technically, anchor lights are not required for boats under 23 feet (7 meters) in length, but to leave your boat unlit at anchor or mooring is risking trouble. Light your boat, even if it’s just a dinghy.

Supplemental Lights

There are literally hundreds of possibilities, so we’ll discuss only a few, highlighting what we do and do not like (also see “Portable LED Rail Lights”).

Mantus Snap On Lights

Initially, we thought this was a bit pricey for a battery-powered light, but over time we realized it filled the roles of several products, a good thing on a smaller boat.

On the high setting, it is as bright as most cockpit lights and will run for 16 hours. Switched to either low or red, it spreads an even light that does not compromise night vision, perfect for reading charts or tidying up underway. Clamped to a high railing, it meets the candela basis of a USCG anchor light; we’ve confirmed this on the water. It makes our F-24 easier to find when return from a mid-night kayak trip.

Multi-Use

It makes a good non-glaring bilge worklight; we’ve dropped it in the water enough times to confirm that it’s waterproof. Clamped to the pulpit it makes a bow worklight, though we would use a head lamp for most night deckwork. It even has an SOS flasher setting. Although it does not meet the standard for an eVDSD (Electronic Visual Distress Signal), it will supplement other signaling means (see “Distress Flares Go Electric”).

Finally, it is rechargeable by USB, and now that most of us have a port somewhere on the boat, it will always be charged without lugging around another charger.

Bottom line: Recommended as a small boat supplemental and a non-USCG emergency anchor light.

Hampton Bay Pathway Lights

Most pathway lights direct the light downwards, toward your feet, with little escaping to the sides. They light up the cockpit a bit, but you can’t see them from a distance. Hampton Bay Silver Pathways lights, on the other hand, direct the light horizontally, perfect for viewing from a distance.

Though not as well focused as an anchor light, the mere 15 lumens output was clearly visible at 1-mile and very nearly meets the 2-mile anchor light visibility standard. The low profile allows them to be slapped on any flat surface with self-adhesive Velcro. We love the price, but unfortunately they only run 4-6 hours, meaning they will protect you from late arrivals and wee hour drunks, but will not stay lit until first light.

Bottom line: This is our Budget Buy for supplemental lighting. Do not expect the light to be on at 2 or 3 a.m. in the morning.

Emergency Anchor Lights

Our search for temporary lights took us into the realm of temporary lights designed specifically for anchoring, and claiming to meet one or more marine specification.

Tecniq Tower Light

Although intended for permanent installation, this USCG-compliant light is tiny, affordable, and could easily be adapted to a rail clamp or other temporary mounting. The diameter is a perfect match for 2-inch PVC pipe, something we learned when installing one on the mast of our F-24. Because it is so low profile, we needed a short vertical extension to clear the wind instrument housing, a short stub of pipe boosted it just enough and gave us a place to hide the splices. Very low power draw and low price make it an outstanding choice for secondary low level anchor light for a boat kept at a mooring.

Bottom Line: Recommended for permanent installation or to make a custom plug-in.

E Safety S6LS Solar Marine Lantern

An improved version of the solar pathway lights, the S6LS has enough battery capacity to last 60 hours, getting you through a stretch of cloudy days. A local marina installed these on the outlying pilings several years ago, and we can see them at 2-miles, just about the same time the USCG fixed lights marking the harbor entrance come into the clear view.

Esafety also makes a slightly version (S8LS, 2-mile vis, 72-hour life, $115), suitable for a boat on a mooring. Too bad neither is USCG approved as an anchor light.

Bottom Line: Recommended for supplemental lighting and as an anchor light for moored boats that lack adequate battery power.

Lonako Solar Positioning Light

The solar power has clear advantages for boats that live on a mooring. In addition to the all-around white light, it also can serve as a tricolor light, and an SOS strobe. A wireless remote control determines which mode it will show. The strobe does meet the USCG carriage requirement for a visual distress signal. It has a convenient rail clamp.

Bottom Line: Recommended for moored boats that lack battery power.

How Bright?

Supplemental lights don’t need to meet a specific standard, but if you are shopping around it helps to understand the output claims—usually expressed in lumens and candela.

A lumen is a measure of total light output in all directions, without focusing. Candela is the intensity of the light within the focused beam, which can be anything from a hemisphere in the case of an area light, down to a narrowly focused beam. If a light emits evenly in all directions it takes about 12.6 lumens of light emission to create 1 candela of intensity. An anchor light, on the other hand, with a beam focused into 6 degrees vertically and 360 degrees horizontally, can produce as much as 2 candela per lumen if the optics are just right, although the actual output is typically closer to 1 candela per lumen.

The 2-mile visibility requirement requires 4.3 candela. An unfocused area light will require 25-50 lumens to meet this standard. Garden lights are typically focused downwards, so the typical 10-lumen light will be visible for less than a mile. With less than perfectly adjusted night vision, PS testing suggests a few hundred yards is more realistic.

PS Testing

We performed additional visibility evaluation of the Mantus Snap-On Light and Hampton Bay Silver Pathway lights, photographing at distances up to 1-mile, calculating intensity, and measuring run time.

In the June 2021 article on electronic visual distress signalling devices, we reviewed the USCG standard. Four handheld products met the standard. None of the devices in this review meet this requirement. A flashing masthead light is not bright enough and does not have independent power supply that the eVSD

More than 50 Lumens for Supplementary Light

If you are considering an unfocused area light to serve as supplementary or backup anchor light, it should have an output of >50 lumens to approximate the visibility required for anchor lights. Be aware that any blocking or partial interference from cabin top structures will decrease visibility significantly.

SOS beacons, intended to be seen from many miles, require a very bright area light, approaching that of a flare. They are expected to be visible at 5 miles and clearly noticeable at a few miles. A blinking anchor light is not bright enough to meet the visual distress signaling standard and does not have its own power supply, which is required of a true eVSD.

Winch Mount

The high point on our test boat’s superstructure is a cabin-top winch. We built a simple mount to keep a Hampton Bay Silver light level and secure from sliding off. We have a similar homemade winch mount we use for our camera.

The standard octagonal winch handle hole fits a 0.70-inch (17.8 mm) square about 1-inch long, and you can extend it as needed to clear low obstructions; we chose 2.5 inches as a compromise between visibility and stability. Teak is a good material; rot-proof, hard, and easy to work accurately.

The Hampton Bay Silver Pathway light was mounted to a 5-inch circle of ¾-inch wood with a counter sunk hole for the screw that secures it to the square winch adapter. (The camera mount uses the same size wood square, but is topped with the swivel portion of a cheap table-top tripod.) You can repurpose the socket of an old winch handle.

Alternatively, you can just place the light on the highest part of the cabin, secured by Velcro. We still recommend mounting the light to a disk of wood with screws, because this adds compression to the bottom plate and improves the weather sealing.

Conclusions

When we went ashore from our cruising cat, we’d leave the cockpit light on, and perhaps a few cabin lights. The cockpit light was not blocked by more than a few degrees in any direction and was quite visible, and the glow of cabin lights through the windows made the length and width of the boat obvious. If the anchorage was isolated, we’d turn off all but the anchor light at night, but if we expected late night traffic, we’d leave the cockpit light on for a bit of security.

With our F-24, lacking an installed cockpit light or anything overhead to fasten it to, we clip a Mantus Snap-On Light to the stern rail. Both are about as bright as the anchor light, with the advantage of lighting up some portion of the deck as well.

What About Emergency Anchor Lights?

A plug-in light will do if the electrical system is still working, and generally it is. Turning on cockpit and cabin lights will work for a single night’s emergency. In the event of general electrical failure, a separate battery powered light also makes good sense. Locate it so that it is visible from all directions.

We’re not saying that supplemental lights are a substitute for a conventional USCG recognized anchor light. Not at all. You need that for compliance, because it is visible above shore lights, and because it is visible at a reliable distance. We’re saying that adding some light down low will make your boat easier to find and reduce the risk of things going bump in the night. Your fellow sailors will also appreciate the improved safety when navigating a crowded harbor at night.

VALUE GUIDE: SUPPLEMENTARY ANCHOR LIGHTS

BRAND	MANTUS	HAMPTON BAY	TECNIQ	ESAFETY LIGHTS	LONAKO
TYPE	Supplemental	Supplemental	Rechargeable Lithium	Emergency Anchor Light	Emergency Anchor Light
MODEL	Snap-On	LED Silver Pathway Lights	Tower Anchor Light	Beacon Light S6LS	LNK-PL-RGW
USCG APPROVED	No	No	Yes	No	No
LUMENS	7-140	15	N/A	N/A	N/A
HORIZONTAL BEAM	1.5-28 cd	3.5 cd	4.5 cd	8 cd	5 cd
VISIBILITY (MILES)	1-3	2	>2	>2	>2
VERTICAL ARC (OUT OF 90 DEGREES)	+90/-20 degrees	+30/-15 degrees	+6/-6 degrees	+10/-10 degrees	-12/+12 degrees
RUN TIME (HOURS)	16-156 hours	6-8	N/A	60 hours	10-12
CURRENT DRAW	N/A	200 mA	100 mA	N/A	N/A
POWER SOURCE	Rechargeable via USB	Solar	Wired	Solar	Solar
DIMENSIONS (W X H)	2.8" x 1.8" (plus clamp)	4.8" x 0.9"	2.5" x 1.2"	6.5" x 6.1	4.5" x 2.8"
PRICE (EACH)	$80	$35 (4 pack)	$52	$200	$90

This article was originally published on 24 September 2021 and has been updated.