THE SHORT ANSWER
It comes down to your tank and your app, not the wattage
At 59W and 60W maximum, the AI Prime 16HD and Red Sea ReefLED G2 60 are in the same power class. The Prime is the flexible, independent compact light, controlled through myAI. The ReefLED G2 60 fits especially neatly on Red Sea tanks, and Red Sea publishes a 50cm maximum water depth along with measured PAR reference points.
Choose the Prime if you want a widely available standalone light for a compact custom tank. Choose the ReefLED if its arm, the ReefBeat app and its published test conditions match your tank. A one-watt difference means nothing, and the published surface PAR doesn’t tell you what light reaches the rest of your aquascape.
DECISION TABLE
Which one is right for your tank?
The mount and app already work together
The ReefLED is the easier choice.
Choice of mount and independence from one brand matter
Treat the Prime and ReefLED as equal contenders.
Published depth data helps, but your installation will differ
Use the ReefLED figures cautiously and check with a real PAR map.
Both compact lights may struggle at the edges
Compare upgrade paths before choosing for today’s cube alone.
01 / IN DETAIL
Similar power doesn’t mean the same light
Watts tell you how much electricity a light uses. They don’t tell you how the light spreads, its spectrum, how well colours blend or the PAR at a coral. These two lights draw almost the same maximum power and can still light a tank differently, because their LED layout, lenses, mounting height and programming differ.
That’s why watts-per-litre rules don’t work. A tall 60-litre cube and a shallow 60-litre peninsula need different coverage. Use the inside length, front-to-back depth, water depth and the size of your coral area. Specs only become useful once you put them in that context.
02 / IN DETAIL
Red Sea gives a clearer depth reference
Red Sea publishes 500 PAR at the surface and 100 PAR at 50cm for the G2 60, along with a stated maximum water depth of 50cm. Those measurements are useful because the distance is stated. They still can’t prove what happens at every point in a 50cm cube, or match your water clarity, surface movement and schedule.
The Prime’s published spread of up to 24 inches is a good shortlist signal, while UK sellers often suggest more cautious use on compact tanks. Neither kind of claim is a guarantee for your corals. Go with the more cautious reading until measurements in your own tank show you can push further.
03 / IN DETAIL
Sticking with one brand can save hassle
A ReefLED on a compatible Red Sea tank can share the designed mount, the look and the ReefBeat app with your other Red Sea kit. That means less setup fuss and one app for everything. The benefit is convenience, not healthier corals, and it’s worth less if the rest of your tank uses other brands and you’d rather not depend on one company.
The Prime is a natural standalone choice, with a wider range of third-party mounts and shades. That freedom suits custom builds, but you still need to check the clamp fits, the lid isn’t in the way and glare is under control. Independence only helps if the whole installation still works well.
04 / IN DETAIL
Check the mount before the light
Compact tanks often have rear filter chambers, lids or narrow glass edges right where a light arm needs to clamp. A light that suits your tank can still be awkward if its mount blocks a chamber lid or stops the tank sitting close to the wall. Note the clamp depth, glass limit, arm reach and the height clearance you need.
Also look at where the light will sit from your sofa, desk or dining table. Mounting higher can improve spread but put bright LEDs right in your eyeline. A shade reduces spill but adds cost and affects airflow. These small everyday details can reasonably decide between two lights that are otherwise very similar.
05 / IN DETAIL
Electricity is effectively a tie
In the same worst-case scenario, the difference between 59W and 60W is less than £1 a year at 26.11p/kWh. Your schedule will make far more difference than the choice of light. Electricity shouldn’t decide this one, unless one option means buying more lights.
If one layout needs two compact lights while the other uses one wider light, recalculate with the number of lights, your real schedule and all the accessories. Energy only becomes a real difference at the level of the whole setup, not one watt on the box.
06 / IN DETAIL
Our verdict
Choose the ReefLED G2 60 when you have a compatible Red Sea tank, want ReefBeat control and value its published 50cm depth data. Choose the Prime when you have a custom compact tank and want a free choice of mounts and the myAI app. On a typical 45cm cube, neither wins on specs alone.
The real tie-breaker is the complete installation: your coral area, the mount, glare, which app you prefer, what’s in the UK box today and where your tank might go next. If those are equal, buy from the retailer with the better support, and put the money you save towards a PAR reading or stability for your tank. Note why you chose, so any future upgrade is judged against your original reasons rather than the latest marketing.
WORKED UK EXAMPLE
Choosing for a 45 × 45 × 45cm custom cube
The tank has no lid, a central rock island, LPS across the lower half and a small SPS ledge near the top. Both lights fit on power and size. The owner measures behind the tank and finds both manufacturers’ arms fit, but the ReefLED arm means the tank has to sit further from the wall.
Because nothing else on the tank uses ReefBeat and the owner wants it closer to the wall, the Prime is the better fit. The light starts on a cautious setting, and the upper ledge is measured before any SPS go in. If the same tank were a Red Sea package with the approved mount already included, the ReefLED could easily be the simpler choice, without it growing corals any better.
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
Which light is more powerful?
Their maximum power draw is essentially the same. Power use doesn’t directly tell you the PAR or coverage you’ll get.
Does the ReefLED’s 100 PAR at 50cm guarantee enough light for LPS?
No. It’s a manufacturer reference under its own test conditions, and doesn’t describe every spot across the tank or every schedule.
Can both lights work on a 50cm cube?
Both can make the shortlist, but corals near the edges, your rockwork and demanding species need cautious planning and measurement.
Should I pick the same app as my pumps?
One app can make life easier, but safety protection and how the light actually covers your tank matter more than having everything in one place.
Which is better value?
Whichever costs less once fully mounted, while covering your coral area without needing a second light soon after.
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.