Grow Lights vs Bunnings: Why Hydroponic LED Lights Are Different (With Real Data)

The question gets asked in every Australian growing community. Can you just use grow lights from Bunnings? It is a reasonable question. Bunnings sells LED grow lights. They say full spectrum on the box. They are a fraction of the price. Why would anyone spend $800 or more on a grow light when the hardware store sells them for $60?

The honest answer is: it depends entirely on what you are growing. For a small herb pot on the kitchen bench or a monstera that needs winter supplemental light, a 30 to 60 watt hardware store light will do the job. For any hydroponic system where you are expecting plants to produce fruit, flowers, or a real yield from seed to harvest, the hardware store light will not deliver what your plants need. This article explains why, using the actual numbers.

What Plants Actually Need From Light

Before comparing any products, it helps to understand what plants are actually measuring when they use light. Plants do not care about brightness the way human eyes do. A light can look extremely bright to you and still be nearly useless to a flowering plant. The metric that matters is PPFD.

PPFD (Photosynthetic Photon Flux Density) measures how many photons of plant-usable light are hitting a square metre of canopy every second. The unit is micromoles per metre squared per second (µmol/m²/s). This is the actual measure of how much light energy is available for photosynthesis at the leaf surface.

PPF (Photosynthetic Photon Flux) is the total amount of plant-usable light a fixture produces per second, measured in µmol/s. Think of it as the total output of the light engine before any is lost to the environment.

Efficacy (µmol/J) tells you how efficiently the fixture converts electricity into plant-usable photons. One joule per second equals one watt. So efficacy tells you how many photons you get for every watt you spend on your power bill. This is where the real cost comparison between lights happens.

Plants need very different PPFD levels at different growth stages:

• Seedlings and clones: 150 to 300 µmol/m²/s
• Vegetative growth: 400 to 600 µmol/m²/s
• Flowering and fruiting: 600 to 1,000+ µmol/m²/s
• High-intensity flowering with CO2 supplementation: 1,000 to 1,500 µmol/m²/s

A plant that does not receive enough PPFD during flowering does not produce as much as it could. It stretches toward the light, produces airy low-density flowers or fruit, and runs through its complete growth cycle without ever being able to express its genetic potential. The limiting factor is not nutrients, not genetics, not environment. It is light intensity.

What Bunnings Actually Sells

The grow lights currently sold at Bunnings are primarily from Sansi, LetPot, and Home Grown. These are consumer-grade products designed for indoor plant care: keeping houseplants healthy, starting seedlings in winter, and growing small herb pots on a bench or windowsill. That is the specific use case they are designed and marketed for.

The Sansi E27 30W is the most commonly recommended option in store. It is marketed as equivalent to 350 watts, which refers to an incandescent comparison that is not relevant to plant growing. The actual light output at growing distance for a 30W lamp is not published as a PPFD figure. Based on the wattage and the lamp category, this type of fixture produces roughly 40 to 80 µmol/m²/s at a standard growing distance. The LetPot range runs from 48W to 100W with similar PPFD characteristics for their wattage.

None of the Bunnings grow light products publish a PPFD chart showing actual light distribution across a growing area. This is a meaningful absence. Professional horticultural lighting manufacturers publish detailed PPFD maps showing exactly how much light reaches every point across the coverage area. Consumer-grade lights do not, because the numbers would not support the use case most hydroponic growers need.

To be clear: these are not fraudulent products. They do what they say. They are just designed for a different purpose.

What Professional Hydroponic Grow Lights Deliver

Here is where the real comparison lives, in the numbers.

SANlight EVO 5-120, $1,049.95

The SANlight EVO 5-120 is a 340W Austrian-engineered fixture that produces a PPF of 915 µmol/s at an efficacy of greater than 3 µmol/J. Two units positioned in a 120x120cm tent deliver a measured average PPFD of 1,160 µmol/m²/s across the full canopy. A single unit in a 120x120 space delivers approximately 600 to 800 µmol/m²/s depending on mounting height, which is sufficient for most flowering applications without CO2 supplementation.

The spectrum runs from 400 to 780nm, extending beyond the standard PAR range into far-red wavelengths that influence photomorphogenesis, the light-driven process that determines flowering time, internode spacing, and canopy structure. The far-red to red ratio in the EVO series is specifically tuned across years of empirical testing to optimise both quality and yield.

The fixture is passively cooled with no internal fans. No fans means no fan failure, no noise, and no dust accumulation in a motor. The IP65 rating means water and chemical spray cannot penetrate to the LED components. SANlight guarantees less than 10 percent light output degradation across a 90,000-hour service life, which at 18 hours per day equates to approximately 13 years of continuous use.

SANlight EVO 3-80, $799.95 and SANlight EVO 4-120, $899.95

The EVO 3-80 at 200W and the EVO 4-120 at 265W carry the same efficiency rating of greater than 3 µmol/J and the same spectrum and build quality as the 5-120. The 3-80 is suited to 80x80cm spaces and smaller tents where a single fixture covers the full footprint. The 4-120 suits 100x100 to 120x120cm applications where a single fixture is preferred. Both share the same passive cooling design, IP65 protection, and 90,000-hour lifespan as the 5-120.

Medic SS420+, $1,549.95

The Medic SS420+ is Australian-designed, Australian-made, and built specifically for Australian growing conditions and the Australian electrical environment. At 430W it produces a PPF of 1,058 µmol/s at 2.52 µmol/J efficacy, driven by a MeanWell HLG driver, the same industrial power supply used in commercial lighting installations worldwide.

The LED chips are Top Bin CREE and Lumiled, meaning they are selected from the highest-performing tier of each manufacturer's production output. The thermal management is the most significant engineering differentiator: the SS420+ uses cold-forged pure aluminium in its heatsink, which achieves a thermal conductivity of 237 W/mK. Standard aluminium alloy used in most grow lights achieves approximately 150 W/mK. That 58 percent improvement in heat transfer means the chips run cooler, degrade more slowly, and place less thermal load on your grow room's climate control system, directly reducing air conditioning costs during Australian summers.

The IP66 rating exceeds the SANlight's IP65, providing full protection against high-pressure water jets, which is relevant in any grow room where regular cleaning occurs. The SS420+ carries a 5-year Australian warranty, serviced from Australia. The fixture's lifespan exceeds 62,000 hours.

The Numbers Side by Side

The Efficiency Gap and What It Means for Your Power Bill

Efficacy is where the long-term cost comparison lives. A light with higher efficacy delivers more photons per watt, which means you pay less in electricity to get the same light intensity at the canopy.

Professional horticultural LEDs in 2025 sit at 2.5 to 3.0+ µmol/J. Consumer grow lights in the 30 to 100W category typically achieve 0.5 to 1.2 µmol/J based on their wattage and light output category. The gap is approximately three times as many photons delivered per dollar spent on power, with a professional fixture.

Put practically: to match the PPFD delivered by a single SANlight EVO 5-120 across a 120x120cm canopy using low-efficacy consumer lights, you would need multiple units running significantly more combined wattage. The upfront saving on the light disappears quickly when running costs are factored in, and the heat load from less-efficient lighting creates additional air conditioning costs that compound over a full growing season.

Why Spectrum Matters for Australian Summers

Both the SANlight EVO series and Medic SS420+ produce a broadband spectrum that extends beyond the standard PAR range (400 to 700nm) into far-red wavelengths at 700 to 780nm. Far-red light influences the phytochrome ratio in plant cells, which directly affects flowering time, internode length, and canopy density. It is not something visible to the human eye and not something consumer grow lights are engineered to deliver.

In Australian summers, heat management becomes a critical factor in grow light selection. The passive cooling design of the SANlight EVO series means no fans to fail and no additional heat from fan motors. The cold-forged aluminium heatsink in the Medic SS420+ transfers heat 58 percent more efficiently than standard alloy, which directly reduces the thermal load on your tent or room's climate control. In Melbourne, Brisbane, and Perth summers where ambient temperatures push 35 to 40 degrees regularly, this is not a minor consideration.

When a Hardware Store Light Is Actually Appropriate

A 30 to 100W consumer grow light from Bunnings or similar retailers is genuinely appropriate for:

• Keeping houseplants alive and healthy through winter with reduced natural light
• Supplemental lighting for a small kitchen herb garden
• Starting seedlings on a windowsill where you need a small top-up of light
• Low-light-requirement plants like pothos, peace lilies, and similar shade-tolerant species

It is not appropriate for full-cycle hydroponic growing, any plant that needs to flower or produce fruit, or any setup where your expectation is a genuine yield from dedicated growing effort.

Choosing the Right Light for Your Setup

The SANlight EVO range covers the most common grow tent sizes used in Australian home hydroponic setups. The EVO 3-80 at $799.95 suits 80x80cm tents. The EVO 4-120 at $899.95 is the single-fixture solution for 100x100 to 120x120cm tents. The EVO 5-120 at $1,049.95 suits high-intensity applications in the same footprint or larger open spaces where PPFD headroom for CO2 supplementation is desired.

The Medic SS420+ at $1,549.95 is the highest-output single-fixture option in the range, carrying a 5-year Australian warranty and purpose-built engineering for Australian conditions. For growers who want a domestically supported, domestically built fixture backed by the longest warranty in the market, it is the premium choice.

For propagation and seedling stages before moving to a main fixture, the SANlight FLEX II propagation bars at $229.95 deliver the appropriate lower PPFD range for young plants without the intensity that would stress early-stage clones and seedlings.

Questions about which light suits your specific tent size and growing goals? Email us at hello@apexgrow.com.au and we will give you a straight answer based on your setup.

Frequently Asked Questions

Can I use Bunnings grow lights for a grow tent?
Not for full-cycle growing with a meaningful yield. Consumer grow lights in the 30 to 100W range sold at hardware stores are designed for houseplants and small herb setups. They do not produce enough PPFD to support flowering and fruiting stages, and they do not publish PPFD data because the numbers would not align with what hydroponic growers need. For any dedicated grow tent setup where you expect a real result, a professional fixture matched to your tent size is the correct choice.

How many watts do I need for a 120x120cm grow tent?
For a single fixture solution, the SANlight EVO 4-120 at 265W delivers full coverage of a 120x120cm tent at appropriate flowering PPFD levels. For higher intensity applications or where CO2 supplementation is being used, the EVO 5-120 at 340W or two units of the same provides the headroom needed. Wattage alone is not the correct measure, efficacy (µmol/J) determines how much of that wattage reaches your canopy as usable light.

What does PPFD mean and why does it matter?
PPFD is the measure of how many plant-usable photons are hitting one square metre of canopy every second. It is the correct metric for evaluating whether a grow light will actually support plant growth at a given stage. Seedlings need 150 to 300 µmol/m²/s. Vegetative plants need 400 to 600. Flowering plants need 600 to 1,000+. A grow light that does not publish its PPFD values is a light that cannot demonstrate it meets these requirements.

Is the SANlight EVO worth the price compared to cheaper LED options?
The SANlight EVO series sits above 3 µmol/J efficacy, which is at the top of the market for horticultural LED efficiency. Cheaper LEDs in the same wattage range typically achieve 1.5 to 2.2 µmol/J, meaning you are getting roughly 30 to 50 percent fewer photons for every dollar spent on electricity. Over a 12-month growing season, the running cost difference between a 3 µmol/J fixture and a 1.8 µmol/J fixture is meaningful. The 90,000-hour lifespan guarantee with less than 10 percent output degradation also means you are not replacing the fixture every few years.

What is the difference between SANlight EVO and Medic SS420+?
Both are professional horticultural LEDs that deliver significantly more PPFD per watt than consumer alternatives. The SANlight EVO series is Austrian-engineered at above 3 µmol/J efficacy with a 3-year warranty and 90,000-hour lifespan. The Medic SS420+ is Australian-made with top-bin CREE and Lumiled chips, a MeanWell HLG driver, IP66 water protection rating, cold-forged aluminium heatsink delivering 58 percent better thermal conductivity than standard alloy, and a 5-year Australian warranty. The SANlight offers better published efficacy numbers. The Medic offers local manufacturing, longer warranty, and superior thermal management for Australian conditions. Both are the correct choice compared to anything in a hardware store.

How far should I hang a grow light above my plants?
Mounting height changes PPFD significantly. All SANlight EVO and Medic SS420+ fixtures include full PPFD maps showing the distribution at different heights. As a general starting point: seedlings and clones benefit from higher mounting (60 to 90cm) to reduce intensity to the appropriate seedling range. Vegetative plants 40 to 60cm. Flowering canopy 30 to 45cm for most setups, adjusted based on your specific PPFD targets and whether CO2 supplementation is in use. Always refer to the specific PPFD map for your fixture and tent size.