For most Australian homes, a 10 to 30W LED floodlight is enough for security lighting at a front door, side path or driveway. A backyard usually needs 30 to 50W, and rural yards or small commercial areas need 100 to 200W or more. Those figures assume a modern fitting producing around 100 lumens per watt. Wattage only tells you power use. Lumens, mounting height and aim decide whether you can actually see who is there.
Security floodlight wattage quick reference
| Area | Recommended lumens | Approx. LED wattage | Mounting height | Beam angle |
|---|---|---|---|---|
| Front door and porch | 700 to 1,000 | 10W | 2.4 to 2.7 m | 100 to 120 degrees |
| Side access path | 1,000 to 1,500 | 10 to 15W | 2.4 to 3 m | 100 to 120 degrees |
| Single driveway | 1,500 to 2,000 | 15 to 20W | 2.7 to 3 m | 100 to 120 degrees |
| Double driveway | 2,000 to 3,000 | 20 to 30W | 3 to 4 m | 100 to 120 degrees |
| Backyard | 3,000 to 5,000 | 30 to 50W | 3 to 4 m | 100 to 120 degrees |
| Shed or workshop exterior | 2,000 to 3,000 | 20 to 30W | 3 to 4 m | 90 to 120 degrees |
| Rural yard | 10,000 to 20,000 | 100 to 200W | 5 to 6 m | 60 to 90 degrees |
| Small commercial yard or car park | 10,000 to 30,000 in total | 100 to 300W across several fittings | 4 to 6 m | 60 to 120 degrees |
Assumptions: a fitting efficiency of 100 lumens per watt, roughly half the light landing on the target area, and a target of 10 to 20 lux on the ground. Change any of those and the wattage changes, which is why the method below matters more than the table.
Watts versus lumens
Watts measure the electricity a floodlight draws. Lumens measure the light it produces. The link between them is efficiency, stated as lumens per watt (lm/W), and it varies a lot between fittings.
| Efficiency | 30W output | 50W output | 100W output |
|---|---|---|---|
| 80 lm/W | 2,400 lm | 4,000 lm | 8,000 lm |
| 100 lm/W | 3,000 lm | 5,000 lm | 10,000 lm |
| 130 lm/W | 3,900 lm | 6,500 lm | 13,000 lm |
| 150 lm/W | 4,500 lm | 7,500 lm | 15,000 lm |
An efficient 50W floodlight at 150 lm/W gives 7,500 lumens, almost the same as a 100W unit at 80 lm/W, for half the running cost. Always compare the lumen figure on the listing, not the wattage on the box.
How to calculate the wattage yourself
- Measure the area you want lit in square metres (length multiplied by width).
- Choose a target light level in lux for the purpose (see below).
- Multiply area by lux to get the lumens needed on the ground, then double it to allow for light that misses the target.
- Divide by the fitting's lumens per watt to get the wattage.
Recommended light levels for security
- General deterrence: about 5 to 10 lux.
- Safe movement on paths, steps and driveways: about 10 to 20 lux.
- Camera identification of faces or number plates: about 20 to 50 lux at the point of capture.
These are practical rule of thumb ranges, not figures quoted from a standard. For context, full moonlight is well under 1 lux and a lit indoor room is commonly a few hundred lux, so security lighting does not need to be dazzling to work.
Worked example
A double driveway measures 6 m by 6 m, which is 36 square metres. At 20 lux, that is 720 lumens on the ground. Doubling for losses gives 1,440 lumens. At 100 lm/W, that is about 15W, so a 20W floodlight is a sensible choice.
Mounting height and beam angle
Light spreads as it travels. Doubling the mounting height spreads the same beam over roughly four times the area, so the ground receives about a quarter of the light level. Higher mounts need more lumens.
| Mounting height | Typical wattage at 100 lm/W |
|---|---|
| 2.4 m (standard eave) | 10 to 20W |
| 3 m | 20 to 30W |
| 4 m | 30 to 50W |
| 5 m | 50 to 100W |
| 6 m (two storey or shed gable) | 100 to 150W |
Wide beams of 100 to 120 degrees suit low mounts and broad areas. Narrower beams of 60 to 90 degrees suit high mounts and long throws down a driveway or yard. Whatever the beam, tilt the fitting down so the brightest part lands on the ground inside your boundary, not out at the horizon.
One large floodlight or several smaller ones
Several lower wattage lights almost always beat one big one. A single 100W floodlight creates a bright pool with hard shadows behind cars, bins and fences, which are exactly where someone can hide. Two 30W lights on opposite corners overlap and fill those shadows. For a backyard, try one light at each end of the house. For a long driveway, place one at the garage and one near the gate.
Lighting for security cameras
More watts is not better for cameras. Too much light at close range overexposes faces into white blobs. Aim for even coverage instead.
- Mount the light beside or behind the camera, never facing the lens, to avoid glare and silhouettes.
- Choose neutral to cool white, around 4000K to 5000K, with a CRI of 80 or higher so clothing, vehicle colours and number plates record accurately.
- When white light comes on, most cameras switch from infrared night mode to colour. There can be a brief adjustment, so a sensor that triggers early gives the camera time to settle.
Motion sensor, dusk to dawn or always on
Motion sensor lights suit homes. The sudden change draws attention and running costs are tiny, so you can afford a slightly higher wattage. Dusk to dawn lights suit entries, commercial yards and camera coverage where constant footage matters, and here a lower wattage is kinder to neighbours and bills. Always on lighting is rarely needed.
Running cost example, assuming 30 cents per kWh: a 50W floodlight running 11 hours a night uses about 201 kWh a year, or roughly $60. The same light on a sensor for 30 minutes a night costs under $3 a year. Check your own tariff.
Position sensors so people walk across the detection zone, not straight at it, and keep them clear of roads and moving trees.
How much is too much?
Over bright security lighting works against you. Glare makes your eyes and your cameras adapt to the bright patch, so the dark areas beside it look even darker. Light spilling into a neighbour's bedroom is also a common cause of council complaints. AS/NZS 4282 is the Australian standard for controlling the obtrusive effects of outdoor lighting, and councils often refer to it. The practical fix is simple: use the lowest wattage that does the job, aim it down and keep the beam within your property.
Australian compliance and installation
- Hardwired fittings: any floodlight wired into fixed wiring must be installed by a licensed electrician.
- Plug in fittings: a floodlight supplied with a fitted plug can be plug and play into a suitable existing weather protected power point.
- RCM mark: the Regulatory Compliance Mark shows the supplier declares the product meets applicable Australian electrical safety and EMC requirements. Do not buy mains powered lighting without it.
- IP rating: look for IP65 or higher for exposed outdoor positions.
- Coastal conditions: salt air corrodes housings and fixings, so choose corrosion resistant finishes and stainless hardware.
You can compare lumen output, IP rating and beam angle across the HEXA LED floodlights range, and read more about HEXA's approach to Australian compliance.
Real property examples
- Suburban home: a 10W sensor light at the front door, a 20W over the double driveway and two 20W lights covering the backyard.
- Rural block with a shed: a 100 to 150W floodlight on the shed gable at 5 to 6 m for the yard, plus 20 to 30W lights over each door. Inside, dedicated shed lighting does the work.
- Small business yard: three or four 50W dusk to dawn floodlights at 4 to 5 m with overlapping beams, positioned beside the cameras.
Common mistakes and pre purchase checklist
Common mistakes
- Buying on wattage and ignoring lumens.
- One oversized light in place of two smaller ones.
- Aiming the fitting outward so it blinds visitors and neighbours.
- Pointing a floodlight toward a camera lens.
- Forgetting the inside of the garage, where good garage lighting matters as much as the driveway.
Pre purchase checklist
- Area measured in square metres and mounting height confirmed.
- Lumens and lumens per watt stated on the listing.
- Beam angle suited to the height.
- Colour temperature and CRI suitable for cameras.
- IP65 or higher, with the RCM mark.
- Sensor or dusk to dawn control decided.
- Licensed electrician booked for hardwired fittings.
Frequently asked questions
Is a 50W LED floodlight bright enough for security lighting?
Yes, for most homes a 50W LED floodlight is more than enough. At 100 lumens per watt it produces about 5,000 lumens, which suits a backyard or large driveway from a 3 to 4 metre mount. For a front door or side path it is usually too bright, and 10 to 20W is a better fit.
How many lumens do I need for a security light?
Most home security lights need between 700 and 5,000 lumens. Allow roughly 700 to 1,000 lumens for a porch, 1,500 to 3,000 for a driveway and 3,000 to 5,000 for a backyard. Rural yards and small commercial areas typically need 10,000 lumens or more.
Do I need an electrician to install a security floodlight in Australia?
A licensed electrician is required for any floodlight that is hardwired into fixed wiring. A floodlight supplied with a fitted plug can be plugged into a suitable existing weather protected power point.
Is cool white or warm white better for security cameras?
Neutral to cool white, around 4000K to 5000K, is generally better for security cameras. Paired with a CRI of 80 or higher, it helps the camera record colours of clothing and vehicles more accurately than a very warm light.
