For spray painting in a home garage, aim for about 400 to 600 lux measured on the panel you are painting, rising to 600 to 800 lux for final inspection and polishing. A garage lit for parking and storage, at around 160 to 300 lux, is not enough to judge a wet coat. Good garage lighting for spray painting is also about where the light lands, because most of a car is vertical and a bright ceiling alone leaves doors and sills in shade.
Lux versus lumens: which number matters for painting?
Lumens describe how much light a fitting produces. Lux describes how much of that light actually arrives on a surface, where one lux equals one lumen spread over one square metre. A fitting can have an impressive lumen figure and still leave a door skin dim if the light is aimed at the floor. For paint work, lux at the panel surface is the number that matters, and lumens are simply how you get there.
Garage lighting for spray painting: lux targets by task
The Australian interior lighting standard, AS/NZS 1680.1, groups tasks by visual difficulty and recommends a maintained illuminance for each class. It lists fine painting and finishing and colour matching in the 400 lux class, and paint retouching and fine inspection in the 600 lux class. The standard is written for workplaces, so treat the table below as our reading of those classes applied to a home garage, not a legal requirement for DIY work.
| Task | Target at the work surface | AS/NZS 1680.1 task class it is based on |
|---|---|---|
| General garage use, parking, storage | 160 to 240 lux | Simple to ordinary tasks |
| Prep, sanding and masking | 320 to 400 lux | Moderately difficult to difficult tasks |
| Primer | 400 lux | Difficult tasks |
| Colour and clear coat | 400 to 600 lux | Fine painting and finishing, colour matching |
| Final inspection, retouching and polishing | 600 to 800 lux | Paint retouching, fine inspection |
How many lumens does a single or double garage need?
To turn a lux target into total lumens, use the lumen method:
Total lumens = (target lux x floor area) divided by (utilisation factor x maintenance factor)
The utilisation factor allows for light absorbed by walls, ceiling and the fitting itself. The maintenance factor allows for dust and LED output dropping over time. As a planning allowance for a garage with light coloured walls and a 2.4 metre ceiling, we use 0.6 and 0.8, which multiply to 0.48. These are assumptions, so confirm the result with a meter.
Single garage, 3 m x 6 m (18 square metres) at 500 lux: 500 x 18 = 9,000 lumens on the working plane. 9,000 divided by 0.48 = about 18,750 lumens of fitting output.
Double garage, 6 m x 6 m (36 square metres) at 500 lux: 500 x 36 = 18,000 lumens on the working plane. 18,000 divided by 0.48 = about 37,500 lumens of fitting output.
| Target | Single garage (18 square metres) | Double garage (36 square metres) |
|---|---|---|
| 400 lux | 15,000 lumens | 30,000 lumens |
| 500 lux | 18,750 lumens | 37,500 lumens |
| 600 lux | 22,500 lumens | 45,000 lumens |
To get a fixture count, divide the total by the rated lumen output on the product specification of the light you are considering. Keep in mind that this method gives an average on a horizontal plane. It does not tell you what reaches a door or a sill, which is why measuring matters.
How to measure the light you have now
A handheld lux meter is inexpensive and far more reliable than guessing. A phone app is fine for comparing one spot with another, but treat its absolute numbers as approximate. With the car or panel in its painting position, take readings:
- Flat on the roof and bonnet, sensor facing the ceiling.
- On each door at mid height, sensor facing outwards from the panel.
- Low on each sill and lower guard, sensor facing outwards.
- At the front and rear bumpers.
- Again while you stand in your spraying position, to see how much your own shadow costs.
If the roof reads 500 lux and the sills read 120, you do not need more overhead output. You need light from the side.
Why ceiling light alone leaves doors and sills dark
Light on an upright surface is called vertical illuminance. Ceiling fittings throw most of their output downwards, so horizontal panels are well lit while doors, guards and sills receive only a glancing share. Body curvature makes it worse, because lower panels tuck under and face the floor.
The fix is side lighting. Wall mounted fittings running along both sides of the bay at roughly door height, or angled slightly towards the car, lift the vertical reading. Portable work lights on stands at knee height cover sills, lower guards and bumpers, and can be moved as you work around the vehicle.
Layout and placement for a home garage paint setup
- Even overhead coverage. Spread fittings across the whole ceiling instead of clustering them in the centre. A continuous grid such as a hexagon LED lighting system avoids the dark bands that widely spaced single fittings leave between them.
- Light from both sides. Light the vehicle from the left and right so one side is never in its own shadow.
- Keep light in front of you. If the only source is behind your shoulder, your body and the gun shade the exact spot you are spraying. Light that extends past the edges of the car solves this.
- Leave working room. A single garage is tight. Plan the lighting around where the car sits with space to walk each side.
If you are planning the overhead layout from scratch, our garage lighting range is a good place to compare grid sizes against your floor area.
Using the light to read the wet film
Experienced painters do not look at the paint. They look at the reflection of the light source in the wet film. As a coat goes on, the reflection tells you what is happening:
- Coverage and wet edge: the reflection turns from dull to glossy as the film wets out. A dull strip means you missed or went too light.
- Orange peel: the edge of the reflected light looks ragged or dimpled instead of crisp.
- Runs and sags: the reflected line bends or bulges downwards.
- Dry spray: the surface stays matt and grainy and never forms a clear reflection.
Long linear light sources help because a straight tube gives a straight reflected line, and any distortion in that line is obvious. This is one reason grids of LED tubes are popular in detailing and paint spaces, since the lines run in several directions across every panel.
CRI, colour temperature, glare and flicker
CRI. For colour matching, look for a colour rendering index of 90 or higher. Under low CRI light, some pigments are under represented, so a blend can look perfect in the garage and visibly wrong once the car is rolled into sunlight. Check the CRI on the specification before you buy.
Colour temperature. Around 5000K is the usual choice for paint work because it sits close to neutral daylight. We cover the 4000K, 5000K and 6500K trade-offs in detail in the garage workshop colour temperature guide on the HEXA hexagon lights blog.
Glare and diffusion. More output is not always better. Bare, intense point sources create hot spots on gloss paint that hide the film around them and tire your eyes. Diffused sources give a readable reflection. Being able to trim output also helps, and HEXA's dimmable hex lighting Classic models dim from the standard wall switch.
Flicker. Poor quality drivers can flicker in a way you may not consciously notice but that contributes to eye strain and headaches over a long session. Look for fittings described as flicker free.
How wall and ceiling colour changes usable brightness
White or light coloured walls and ceilings bounce light back onto the sides of the car, which lifts vertical illuminance for free. Dark paint or bare brick absorbs it. If we drop the utilisation factor from 0.6 to 0.4 to reflect dark surfaces, the same 500 lux target in a single garage rises from about 18,750 to about 28,000 lumens. Painting the walls white is often the cheapest lighting upgrade available.
Safety, ventilation and Australian electrical notes
Brightness is only part of a safe setup. Solvent based paints release flammable vapour, and overspray can form an ignitable mist. Ordinary garage light fittings, HEXA hexagon lights included, are general purpose luminaires. They are not hazardous area equipment and should not be treated as spray booth lighting.
- Regular or large volume solvent spraying belongs in a purpose built booth with suitably rated equipment. Safe Work Australia publishes a code of practice for spray painting that is worth reading even for home use.
- Ventilate strongly, keep ignition sources out of the space, and keep portable lights, leads and power boards away from the spray zone.
- Two pack paints containing isocyanates carry serious health risks and need proper respiratory protection, not a dust mask.
- Any hardwired lighting must be installed by a licensed electrician. Plug and play systems should still carry the RCM mark.
Spray painting lighting checklist
- 400 to 600 lux on the panel for colour and clear, 600 to 800 lux for inspection.
- Readings taken on the roof, doors and sills, not just the floor.
- Light from both sides plus portable low level lights.
- CRI 90 or higher and around 5000K for colour work.
- Diffused, flicker free sources with visible linear reflections.
- Light coloured walls and ceiling.
- Ventilation and ignition risks dealt with before you pull the trigger.
Frequently asked questions
How many lux do you need for spray painting in a garage?
Aim for about 400 to 600 lux measured on the panel you are spraying, and 600 to 800 lux for final inspection and polishing. Those figures line up with the AS/NZS 1680.1 task classes for fine painting, colour matching and paint retouching. General garage lighting of 160 to 300 lux is not enough to judge a wet coat.
How many lumens do I need to spray paint in a single garage?
For a 3 m x 6 m single garage at 500 lux, plan for roughly 18,000 to 19,000 lumens of total fitting output with light coloured walls and ceiling. Dark or bare brick walls can push that towards 28,000 lumens. Treat these as planning figures and confirm the result with a lux meter.
Is 5000K or 6500K better for spray painting?
Around 5000K is the usual choice because it sits close to neutral daylight and makes colour easier to judge. Colour rendering matters just as much, so look for CRI 90 or higher when colour matching is the goal.
Can I use normal LED garage lights while spray painting?
Ordinary garage light fittings are general purpose luminaires and are not rated for hazardous areas where flammable vapour can build up. Small jobs with strong ventilation are a different risk to regular solvent spraying, which belongs in a purpose built booth with suitably rated equipment. If in doubt, speak with a licensed electrician before you spray.
Do I need side lighting as well as ceiling lights?
Yes. Ceiling lights mostly light horizontal surfaces such as the roof and bonnet, so doors, guards and sills can read far lower than the top of the car. Wall mounted or portable lights at both sides of the vehicle lift the vertical illuminance where most of the paint actually goes.
