THE SHORT ANSWER
60cm is where one compact light stops being the obvious answer
For a 60 × 40–50cm reef with corals in the middle, one Radion XR15 G6 Pro, Kessil A360XE or Reef Flare Pro S makes a sensible single-light shortlist, as long as the maker’s spread fits how you’ll mount it. One AI Prime 16HD or ReefLED G2 60 can suit a modest central island, but don’t expect it to light demanding corals evenly from end to end.
Go for two lights when your rockwork forms separate islands, branching corals will fill the width, or even SPS coverage matters more than the tidy look of one central fixture. Work out the layout first; the brand comes second.
DECISION TABLE
Which one is right for your tank?
A narrow coral area and moderate light needs
One compact light may be enough; keep corals away from the edges.
Corals at different heights, spreading over time
One wider 60cm-class light is the simplest place to start.
A central light casts shadows on the inner faces
Two smaller lights can overlap better.
Even coverage and self-shading really matter
Plan for several lights or bars, and check with a full PAR map.
01 / IN DETAIL
Measure where your corals will actually go
A 60cm tank rarely needs the same intensity across all 60cm. Sand at the ends, a gap at the back and open swimming space all shrink the area your corals actually use. Measure the length and front-to-back depth you plan to cover with coral, then note your highest and lowest shelves. That rectangle is what your lighting has to serve.
A single 40cm central island lets a compact light work with room to spare. Two 22cm islands with open water between them may need two lights, even though the coral area is about the same. The shape of the empty space matters, because it decides where shadows fall.
02 / IN DETAIL
Lights that can work on their own
EcoTech recommends a 24-inch spread for the XR15 G6 Pro, which makes it the natural premium single light to compare for a 60cm tank. Kessil lists 24 by 24 inches for a mixed reef and a narrower 20-inch area for SPS with the A360XE. Reef Factory claims up to 60 by 60cm for the Reef Flare Pro S. These claims tell you which lights are worth considering, not which is best.
Compare the full price once mounted, the maximum power draw, how you’ll control it, how much light spills into the room and how the maker backs up its coverage claim. A light that technically reaches the glass can still leave the edges too dim for demanding corals. Keep those corals well inside the safe area until you’ve measured.
03 / IN DETAIL
When two compact lights work better
Two AI Primes (or similar) let each light sit over an island, with the light overlapping in the middle. That can soften hard shadows and keep corals well lit as they grow. It also means two arms, two cables and two power supplies, and it can cost more than one premium light.
Don’t decide on total watts. Two lower-powered lights can spread light more evenly than one powerful puck, while a wider modern lens can make a single light the simpler choice. Sketch both layouts from above and from the front. Mark where rock blocks one light, then see what a second light actually fixes.
04 / IN DETAIL
Depth and mounting height change the shortlist
Corals 35cm below the surface are a different job from corals near the bottom of a 55cm-deep tank. More distance can mean you need more output or a smaller coral area, but lowering the light to compensate can shrink its spread and create hotspots. Use the maker’s recommended mounting height, and include the distance from the waterline to your corals.
Mounting higher can make a 60cm tank look more evenly lit, but more light spills into the room. In a UK living room where you watch the tank from the sofa, glare may be what limits you. Think about shades and eye level before you buy.
05 / IN DETAIL
Choose by what you keep, but don’t treat coral labels as exact
Soft coral, LPS and SPS are broad groups for planning, not exact PAR targets. Species differ, so does what a coral has got used to, and one colony may do best somewhere a generic chart wouldn’t suggest. Use the group to decide how much headroom you need, then use good care information and real measurements to decide where things go.
A mixed reef works best with deliberate zones: higher central shelves for demanding corals, moderate areas in the middle, and lower or shaded spots for animals that prefer less light. A good lighting plan gives you choices, rather than trying to force one number across the whole tank.
06 / IN DETAIL
Budget for the next two years
If the tank will stay a modest soft coral island, a compact light can be the sensible long-term choice. If you want corals from wall to wall, price in the second light or extra bars now. The cheapest starting setup is poor value if your grown-in reef will force you to replace the mount and buy again.
Work out electricity from the schedule you’ll really run. Two 59W lights running at an average of 70% use less than their combined maximum, but the number of lights still matters. Add mounts, controller accessories and the cost of renting or borrowing a PAR meter to your budget.
07 / IN DETAIL
Our shortlist
For a compact central reef, start with the AI Prime 16HD and ReefLED G2 60. For a single light over a 60cm mixed reef, compare the XR15 G6 Pro, Kessil A360XE and Reef Flare Pro S. For two islands or full-width SPS, price up two lights and consider fill lighting. These are routes to consider, not a ranking that suits everyone.
Whichever you choose, start gently, save your schedule and measure before putting demanding corals near the edges. The right light gives your grown-in aquascape usable light everywhere you need it, without forcing an awkward and expensive fix later.
WORKED UK EXAMPLE
A 60cm peninsula tank viewed from two sides
The tank is 60cm long, 45cm wide and 40cm from waterline to sand. Rock runs along the centre, with corals planned on both long faces. A single puck light can light the top well, but the ridge shades the far face, depending on which side you’re looking from.
Rather than buying one light because it claims 60cm, the owner prices two smaller lights set either side of the ridge, and one wider central light with fill bars. The two-light layout costs more in mounts but gives more freedom in where corals go. Whichever wins is started at low output, and low-light animals go in before the PAR map is done.
WHAT WE CAN AND CAN’T TELL YOU
What this comparison can prove, and what it can’t
Power draw, dimensions, published spread, controls and what’s in the box are facts we can check. They help rule out the wrong lights and show the true cost once installed. They can’t prove the PAR at a particular coral, how colours develop over time, how loud the fan will be in your room, or how reliable it will be over several years. Those depend on the individual light, how it’s installed and programmed, your water, aquascape and maintenance.
Before changing a light on a tank that’s doing well, write down your current light, its mounting height, schedule, channel settings and where each coral sits. Take photos under the same settings and, if your corals are demanding, borrow or rent a PAR meter. Change one thing at a time, start cautiously and use the acclimation mode. A schedule copied from the internet is a starting point, not proof the same percentages will suit your tank.
That’s why our recommendations are conditional. “Best for” means the light handles that situation best on the evidence available, not that everyone should buy it. A cheaper light can be the smarter choice for a small soft-coral island, while a pricier system earns its place when you genuinely need wider coverage, several lights working together or room to expand.
RUNNING COSTS
Compare the full cost once it’s mounted
Add up the light, the arm or hanging kit, any rail, diffuser or shade, a controller if it needs one, and a second light if your tank needs it. Then work out the electricity from the output and hours you’ll actually programme, rather than assuming it runs at full power all day. A premium light can be worth it for better spread or control, but not just for higher wattage or a longer feature list.
Also price the parts most likely to fail: power supplies, fans and mounts, and check how UK warranty claims work. App control is convenient, but find out what the light does after a power cut, a new router or an app outage. Keep the manual and your final schedule somewhere outside the app, so you can recover your setup without your phone or the internet.
COMMON QUESTIONS
Frequently asked questions
Can one AI Prime light a 60cm tank?
It can suit corals kept to a central area, but don’t expect it to light demanding corals evenly across the whole tank.
Is one XR15 enough for a 60cm tank?
It’s a sensible place to start, since EcoTech recommends a 24-inch spread. You still need to check it against your depth, rockwork and coral placement.
Are two lights always better?
No. They can improve overlap and reduce shadows, but they add cost, clutter and complexity.
How high should the light be?
Start with the maker’s recommended range for your model and adjust after measuring. Higher usually means wider spread and more spill, but less intensity.
Should I choose a light by tank litres?
No. Use the length and depth of the area you want lit, how deep your corals sit, and your aquascape.
SOURCES
Check the specifications yourself
These links go to the manufacturer information we used. Coverage figures are the maker’s claims unless we say we measured them.