Quick Answer: Best Grow Lights for Hydroponics Australia
- Modern LED grow lights deliver equal or better yields than 600W HPS while using 40 to 60 percent less electricity.
- SANlight EVO 4-120 operates at 3.1 µmol/J, one of the highest efficacy ratings available in Australia.
- Medic SS420+ is the higher-output option for 120x120cm tents, with Australian manufacturing and local warranty support.
- HPS still makes sense in cold climates where the heat it produces reduces winter heating costs.
- Hardware store grow lights typically output 50 to 150 µmol/m²/s, not enough for fruiting or flowering crops.
- Match your fixture to your tent footprint, since a light built for 60x60cm will underperform in a 120x120cm space regardless of wattage.
- Our single SANlight fixtures include the power cord and dimmer. SANlight sell both separately everywhere else, so check what a quoted price covers.
LED grow lights are now the best choice for indoor hydroponic growing in Australia. Modern full-spectrum LEDs like SANlight deliver equal or better yields than 600W HPS while using 40 to 60 percent less electricity and producing significantly less heat. For most Australian growers, LED is the right choice for both new setups and HPS upgrades.
Why LED has become the default choice for indoor growers in Australia
Five years ago, 600W HPS was still the benchmark for serious indoor growing in Australia. Today, LED has overtaken it for most applications. The reasons are straightforward: lower running costs, less heat to manage, longer fixture lifespan, and efficacy ratings that now match or exceed HPS in terms of usable light delivered to the canopy.
The challenge is that not all LEDs are equal. The market is flooded with fixtures that look impressive on paper but underdeliver in practice. If you're weighing a proper fixture against something from a hardware store, our grow lights vs Bunnings comparison walks through exactly why the two are not interchangeable for a fruiting or flowering crop. This guide focuses on two LED options that are worth considering for Australian indoor growers.
What to look for in an LED grow light
Efficacy, measured in µmol/J, is the most important number on any LED spec sheet. It measures how efficiently the fixture converts electrical energy into photosynthetically active light. Anything above 2.5 µmol/J is considered high efficiency. Below 2.0 µmol/J and you are paying more to run the light than you need to.
PPF, measured in µmol/s, tells you the total photon output of the fixture. Combined with efficacy, this tells you how much usable light the fixture produces and how efficiently it produces it.
A PPFD coverage map shows how evenly the light distributes across your canopy at a given hang height. A high PPF number means nothing if the light creates hotspots in the centre and dark edges.
Heat output matters in Australian summers, where a fixture that runs hot adds meaningfully to your cooling load. Look for fixtures with at least a three to five year warranty and a track record of reliable performance.
And what is actually in the box. This one is easy to miss. SANlight ship their single EVO fixtures as the light and instructions only, with the power cord and dimmer sold separately in every market. Medic ship theirs ready to run. That is a real difference of around $90 when you are comparing two quoted prices, and it is worth checking before deciding which looks cheaper.
Match the Fixture to the Tent Footprint
Before comparing specs, settle the footprint. Every quality fixture publishes a coverage area, and that number decides which tent you need rather than the other way round. A fixture rated for 120x120cm in a larger tent leaves the canopy edges under-lit, and the plants in those corners stretch while the centre does fine.
Our grow tent range lists internal dimensions for each model so the two can be matched properly, and our grow tent guide covers sizing in more depth.
SANlight EVO 4-120
The SANlight EVO 4-120 is built in Austria to a standard that most LED manufacturers do not come close to. It delivers 3.1 µmol/J efficacy, making it one of the most efficient LED fixtures available in Australia.
The bar-style design delivers even PPFD distribution across the canopy, eliminating the hotspot-to-shadow variation that disc-style LEDs create. Passive cooling with no moving parts means no fans to fail, no noise, and significantly less radiant heat than comparable HPS or lower-efficiency LED fixtures.
At 265W it is a single-fixture solution for tents from 100x100cm up to 120x120cm. The HOMEbox Q120+ (120x120cm) is the natural match. For a narrower footprint, the HOMEbox R120S (120x60cm) works with a single unit and leaves headroom. Ours ships with the angled power cord and the M-Dimmer included, so there is nothing further to buy before it runs. If you're deciding between SANlight and a more budget-oriented brand, our SANlight EVO vs Spider Farmer comparison covers that specific decision in detail.
Medic SS420+
The Medic SS420+ is a 430W full-spectrum LED grow light designed and manufactured in Australia. At 2.52 µmol/J efficacy and 1058 µmol/s PPF, it delivers output comparable to a 600W HPS with significantly lower running costs and heat output.
It is designed for Australian conditions with local warranty support and parts availability. The higher total PPF suits a 120x120cm tent like the HOMEbox Q120+, or a slightly larger footprint where you want PPFD headroom for CO2 supplementation.
SANlight EVO 4-120 versus Medic SS420+
The SANlight EVO 4-120 wins on efficacy at 3.1 µmol/J versus 2.52 µmol/J, and over a full season the difference in electricity costs is meaningful. The Medic SS420+ delivers higher total PPF, making it better suited to larger canopies or growers transitioning from 600W HPS.
Both run cooler than HPS, with SANlight's passive cooling giving it a slight edge in heat management. Medic has local manufacturing and support. SANlight is imported but well-supported through Australian distributors. Both are premium fixtures, and the SANlight commands a higher price per watt, justified by its efficacy rating and build quality.
One practical difference worth knowing: the Medic arrives ready to run, while a SANlight bought elsewhere usually needs a cord and dimmer on top. Ours includes both, which closes that gap.
Moving from HPS to LED
If you are transitioning from a 600W HPS to LED, expect a period of adjustment. LED light has a different spectral profile to HPS and plants often respond with tighter internodal spacing and slightly different leaf morphology in the first cycle. This is normal and resolves as your plants adapt.
The practical benefits show up quickly: lower tent temperatures, reduced electricity bills, and less heat stress during Australian summer months are all measurable from the first run. Most growers who make the switch do not go back.
One thing worth planning for: higher-output LED drives faster growth, which raises nutrient demand, and calcium in particular. If you move to LED and start seeing interveinal yellowing that was not there before, the lights have not caused a deficiency so much as exposed a feed that was already marginal. Our Cal-Mag guide covers that properly, and supplements are in the additives range.
Which one to choose
For growers prioritising maximum efficiency and long-term running cost savings, the SANlight EVO 4-120 is the stronger choice. For growers transitioning from HPS who want high output in a familiar footprint with local support, the Medic SS420+ is a proven, reliable option. Both will outperform budget LED alternatives in yield quality and consistency over multiple cycles.
Hydroponic grow lights and grow lamps in Australia
For the full range of hydroponic grow lights and grow lamps available in Australia, including the SANlight EVO range, Medic SS420+, and HPS options, browse our lighting collection. If you are only lighting seedlings and clones rather than a flowering canopy, the propagation range has fixtures sized and priced for that job instead.
Which Light to Buy
For a single 120x120cm tent, the SANlight EVO 4-120 is the option this guide keeps coming back to, and for good reason, it's the benchmark most other lights here get compared against. If you want higher total output in the same footprint, or prefer Australian manufacturing and a five-year local warranty, the Medic SS420+ is the alternative.
Match the light to your tent, not the other way around. The grow tent range lists internal dimensions for every model, so check the fixture's published footprint against the tent before buying either.
Building a complete setup? The Grow Tent Kit Builder sizes SANlight fixtures to your tent from their own coverage figures, then builds the rest of the kit around them.
Frequently Asked Questions
Does the SANlight come with a power cord and dimmer?
Ours does. SANlight sell both separately in every market, so a fixture bought elsewhere usually needs around $90 of accessories before it will run. The Medic SS420+ arrives ready to go. Worth checking what any quoted price actually includes.
Is LED actually better than 600W HPS?
For most Australian setups, yes. Equal or better yields at 40 to 60 percent less electricity, with far less heat to manage through summer. HPS still has a case in cold climates where the heat offsets winter heating.
What efficacy number should I be looking for?
Above 2.5 µmol/J is high efficiency. Below 2.0 and you are paying more in electricity than you need to for the same light at the canopy.
Will one EVO 4-120 cover a 120x120cm tent?
Yes. At 265W it is a single-fixture solution for 100x100 up to 120x120cm. Two units are only needed if you want PPFD headroom for CO2 supplementation or are covering a larger footprint.
Do I need more Cal-Mag after switching to LED?
Often, yes. Faster growth raises calcium demand, which can expose a feed that was already marginal under weaker lighting. The light has not caused the deficiency, it has revealed it.
Which suits a grower coming from HPS?
The Medic SS420+ delivers higher total PPF and is the closer like-for-like replacement for a 600W HPS. The SANlight wins on running cost over a full season.