The Six Moon Designs Lunar Duo is not a larger version of the popular Lunar Solo; rather it’s an entirely new tent design. Its 44.3 ounce trail weight (including stakes) may seem a bit high for a single-wall silnylon two-person tent, so it’s important to point out at the beginning of this review that this is a BIG tent, with 58 square feet of protected area. If you’re looking for a really roomy two-person single wall tent, the Lunar Duo may fill the bill.
- Very roomy shelter for two people
- Very lightweight for the amount of protected area (58 ft2)
- Two doors and two vestibules
- Trekking pole support saves weight
- Large vestibules
- Easy entry
- Top vents and abundant mesh provide good ventilation
What’s Not So Good
- Small storage pockets
- Does not set up well with taller fixed-length trekking poles
- Stakes are not included
- High vents are small
|2007 Six Moon Designs Lunar Duo|
|Three-season, two-person single-wall tent with floor, two doors, and two vestibules|
|30d, 1.3 oz/yd2 (44 g/m22) silnylon canopy; no-see-um mesh doors and lower side vents; 70d, 2.3 oz/yd2 (78 g/m2) silnylon floor|
Poles and Stakes
|Two curved aluminum poles at ends of ridge, requires two trekking poles or optional carbon fiber poles for support, stakes (six required) not included|
|Length 90 in (229 cm), width 54 in (137 cm), height 45 in (114 cm)|
|14 in x 6 in (36 x 15 cm)|
|Measured weight 2 lb 11.1 oz (1.22 kg), manufacturer specification 2 lb 12 oz (1.25 kg)|
|Measured weight 2 lb 12.3 oz (1.26 kg); includes tent body, two aluminum spacer poles, and six Easton aluminum stakes|
|58 ft2 (5.4 m2); floor area is 34 ft2 (3.16 m2), entry vestibules are 24 ft2 (2.23 m2)|
Floor Area/Trail Weight Ratio
Protected Area/Trail Weight Ratio
|1.3 oz/yd2 (44 g/m2) ultralight silnylon floor (no charge), carbon fiber poles (1.8 oz/51 g, $25 each)|
For those familiar with the Hilleberg Rajd tent, the new Six Moon Designs Lunar Duo has some striking similarities. Both have a broad ridgeline supported at the ends with trekking poles, which provides a lot of interior volume. But that’s where the similarity ends. The Lunar Duo has mesh side and interior end walls and two huge vestibules, which gives it much better ventilation and gear storage than the Rajd. The following photo gallery provides a tour of the tent’s design elements.
Views of the Six Moon Designs Lunar Duo. Both sides of the tent (top left) have a large vestibule entry. The top of the tent is 54 inches wide (top right), which provides a LOT of interior volume and headroom. The top view (bottom left) helps to put the tent’s proportions into perspective. With both vestibules tied open (bottom right), the tent’s mesh entry and large doors are visible.
Because of its larger footprint, the Lunar Duo requires more space than many two-person tents. Setup is fast and easy: spread the tent out on the ground, insert two curved aluminum poles into their sleeves at the ends of the ridgeline, stake out the four corners of the tent, raise the tent and insert the tip of a 45-inch trekking pole into a grommet at one side and stake out the vestibule, and repeat for the other side. Six stakes (not included) are required for a basic pitch. Because the tent has a broad profile, which gives it more wind resistance, I strongly recommend adding four guylines (loops provided) for a more secure pitch.
The Lunar Duo is fussy about trekking pole length; 45-47 inches seems to be the optimum length, and adjustable poles are easiest to adjust to the proper length . Taller fixed-length poles can be used if the poles are inserted first and the corners staked last, but the extra height throws the tent’s geometry offand the vestibules become limp. It’s also notable that the use of grommets to attach trekking poles requires poles with good tips; a pole with a worn-down tip could slip out and puncture the tent.
The Lunar Duo uses two curved aluminum struts (left) to create its rounded ridgeline and distribute tension on the canopy. They slip into a sleeve (right) at each end of the ridgeline. Although it’s convenient to leave the struts in their sleeves, they make the rolled tent about 24 inches long, which is not easy to pack.
Entry is through a zippered vestibule on each side, which shelters a vertical mesh wall with a large zippered door. One or both sides of the large (12 square feet each) vestibules can be tied open for better breezes and views in fair weather, or closed to provide extra sheltered space. The total protected area is a whopping 58 square feet, 34 square feet of floor space plus 24 square feet of vestibule space. This is a big tent! When the vestibules are closed, it’s very convenient to leave the interior mesh doors open and reach gear in the vestibules on each side. Because of the tent’s wide body, steep sidewalls, and generous headroom (45 inches), all of the interior space is usable, and its easy to reach into the vestibules from inside the tent.
The Lunar Duo is supported with trekking poles or optional carbon fiber poles (1.8 oz, $25 each). Both vestibules will tie completely open to provide good views and breezes in fair weather.
Although the body of the Lunar Duo resembles the Hilleberg Rajd, the Lunar Duo is a vast improvement in terms of ventilation. The side entry walls are solid mesh, there are mesh panels at both ends, and there are two high vents at the tops of the vestibules. Also, the vestibules have about a 6 inch gap at the bottom, which allows air to more freely circulate through the tent.
The Lunar Duo’s 54-inch wide x 90 inch long floor (top left) provides plenty of room for two people plus gear. The entry walls are mesh with a large zippered door. The end walls are also mesh at the bottom. The interior mesh storage pockets (top right) are in a convenient location, but they don’t hold very much and things fall out easily. The vestibules (bottom left) are zippered and easy to reach into from inside the tent. A high vent on each end of the ridgeline (bottom right) assists with ventilation.
I tested the Lunar Duo on several trips in late winter through early summer. On clear/calm/cold nights (down to freezing or below) the Lunar duo with the doors and vestibules closed consistently developed moderate condensation (or frost) inside, which is typical for a single wall tent. With the mesh doors open (bugs willing) and vestibules closed there was light or no condensation inside, depending on breezes. The steeper tent walls help to avoid brushing against them when they are wet, but there is usually some contact when there are two people inside (as shown in the photo). Larger top vents would help to reduce condensation when the tent is zipped up.
The Lunar Duo is prone to condensation inside on clear/calm/cool nights with the doors closed, like any other single wall tent. It helps a lot to leave the mesh doors open at night, if possible.
Environment inside the Six Moon Designs Lunar Duo. Left Graph: On a cloudy March night with a shower, I kept the mesh doors closed until 3 AM, then opened them. Moderate condensation formed on the inside tent walls with the doors closed (note that the air temperature hit the dew point temperature), then disappeared by morning when I opened the mesh doors. Right Graph: On a clear/calm/cool May night, I kept one door and vestibule completely open and the second door unzipped and its vestibule closed. In the morning I had moderate condensation inside the tent.
The Lunar Duo has a broader profile than many tents, so it is more affected by wind. Even in the moderate 10 to 15 mile per hour winds I experienced, the tent distorted significantly. For adequate wind stability (and to protect your investment), I strongly recommend using 6-inch Y-stakes or Easton tubular stakes, and attaching four guylines to the tent sides (ten stakes in all). However, the guylines are only attached to tent seams rather than poles. With its large surface area and lack of internal structure, the Lunar Duo is not going to be a particularly stable tent in high winds, in my opinion.
On the ergonomic side, my wife and I found the Lunar Duo to be fast and easy to set up, easy to enter and exit, and very roomy inside. The separate vestibule/entry on each side is very convenient for two people, and very versatile. In fair weather we could tie one side of the vestibule and the mesh entry door open to catch more breezes and views. And at night or in rainy weather we could zip the vestibules closed and leave the mesh doors open, which had the effect of incorporating the vestibules into the usable space inside the tent. While sitting inside the tent, we could easily reach things in the vestibules.
The Lunar Duo is overkill for one person, and just plain luxury for two. It’s a very roomy tent, with 58 square feet of protected area inside, which makes it ideal for two people who want more room. It would also be a good choice for a lightweight base camping tent because of its roominess. While it’s possible to find a two-person single wall tent that weighs about 12 ounces less, it would not have nearly as much protected area as the Lunar Duo.
Note that this review is based on the Lunar Duo with a standard (70 denier silnylon) floor, which weighs 4 ounces more than the lightweight (30 denier silnylon) floor. The standard floor is certainly recommended for more abrasive ground surfaces, and will undoubtedly last longer. However, a 30 denier silnylon floor is commonly used on many single wall tents, and holds up very well with reasonable care.
In addition to its large area/weight ratio, the Lunar Duo is also well ventilated, which is a necessity for a single wall tent. Except for enlarging the top vents to increase ventilation when the tent is completely zipped up, I don’t see any way that the Lunar Duo’s ventilation could be improved.
In our forums several readers have asked for a comparison of the Lunar Duo and the Tarptent Double Rainbow. By the numbers, the two tents appear to be similar in size, but based on my personal experience with both tents, I can say that the Lunar Duo is clearly a roomier tent. One factor that makes a big difference is the width of the tent body at the top - the Tarptent Double Rainbow measures 18 inches, while the Lunar Duo is 54 inches. That makes a huge difference in interior room. Also, while the floor width of the Double Rainbow is given at 54 inches (with the bathtub floor laid flat), I measured the actual width to be 48 inches. The Double Rainbow is in fact quite narrow for a two-person tent. In spite of the size difference, the weights of the two tents are identical (40.9 ounces with stakes and ultralight floor; weight of trekking poles is not included in the weight of the Lunar Duo) because of the weight of the Double Rainbow’s 12 foot long ridgepole. Bottom line, the Lunar Duo is a much roomier tent for the weight. However, the Double Rainbow costs $25 less, it does include stakes, and is more wind stable because of its curved profile. Both tents have good ventilation, but will develop heavy condensation inside on a clear/calm night with a large temperature drop.
Six Moon Designs Lunar Duo (left) and Tarptent Double Rainbow (right). The Lunar Duo’s ridgeline is 54 inches wide versus the Double Rainbow’s 18 inch ridgeline, making it a much roomier tent inside. The two tents weigh the same.
Because of the Lunar Duo’s jumbo size and large fabric panels, it is more susceptible to winds than many two-person tents, and requires extra staking for adequate wind stability. Four tieout loops are provided to attach guylines to the sides the tent, and I strongly recommend using them. Even with extra staking, the Lunar Duo would not do well in high winds, in my opinion.
The Lunar Duo has a remarkable protected area to weight ratio, and is very well ventilated. It’s a good choice for a lightweight roomy two-person tent or a base camping tent.
Recommendations For Improvement
- Provide stakes with the tent
- Enlarge the high vents to increase ventilation when the tent is closed up
- Make the interior storage pockets larger and more usable