Working under the bonnet: which light when the bay light cannot reach?

A technician in safety glasses and nitrile gloves leaning into an engine bay with both hands behind a hose, a headlamp beam lighting the recess.

Working under the bonnet? The bay light stops at the first hose.

You look at the job with the bay light first and put a light where the shadow is. Then you reach in with both hands, and a headlamp follows your eyes.

Short answer

If your workshop already issues a light that reaches the recess, keep it. If you are buying: the Nitecore NWH20 headlamp on its middle setting, and the NWL20 work light on its hook or magnet, where you need light that stays put.

See the kit ↓

The job at a glance

Working under the bonnet, in wheel arches and in footwells that the bay lighting does not reach, plus looking at the paint finish of a part on a bench.

This page does not cover running engines, vehicle lifting, fuel, spraying and solvents, electrical or EV high voltage work, or hazardous atmospheres. Your workshop’s risk assessment covers those. The Ministry of Manpower says employers are responsible for identifying safety hazards and taking steps to eliminate or reduce the risks.

  • 0.3 to 0.6 mhow close you work to the target
  • Both handsin the bay, so the light cannot be held
  • 12 hNWH20 on its middle setting, one charge
  • 2 lightsone on your head, one that stays put

The job in six steps

  1. Look with the bay light firstNote what it leaves in shadow.
  2. Hang or stick a light in the shadowThen both hands are free.
  3. Reach in with the headlamp following your eyesRead the label or clamp at 0.3 to 0.6 m.
  4. Move a light to the shadow sideA hose or your own hand can block the first light.
  5. Check a painted part on the benchUnder your workshop’s own inspection light.
  6. Count every lamp and battery back inAgainst a checklist, at the end.

Your job, step by step

1. Before you pick a lightLights off
Bay light onlyLook at the job under the bay light. The shadow behind the first hose is where it stops.
An open engine bay under ordinary workshop ceiling lights, the area behind a hose in shadow and no headlamp or work light on.
2. Where the shadow isWork light on
Hang it on the bonnet edge or stick it to steelThe NWL20 has a pull-out hook and a magnet base, and the base tilts from 0 to 180 degrees. Use its flood on the middle setting (260 lumens).
A yellow and black work light hanging from the open bonnet by its hook, lighting the engine bay below while a technician stands back.
3. Reaching into the bayHeadlamp on
Middle setting, pointed where you lookUse 300 lumens in neutral white. Both hands are busy on a hose clamp, so the beam follows your eyes.
Gloved hands on a hose clamp deep in an engine bay, a headlamp beam lighting the clamp and a small label.
4. The shadow movesWork light on
Place a light low, beside the wheel archAim the work light across the arch from the side the shadow comes from.
A small yellow and black light placed on the floor beside a front wheel, lighting the inside of the wheel arch from the side.
5. At the benchHeadlamp off
Painted part under the workshop’s inspection lightThe same panel can look different under a different light. Judge the finish under the light your workshop accepts.
A painted grey car panel on a clean workbench under a bench inspection lamp, a gloved hand on its edge.
6. End of the jobLights off
Lay everything out on a trayCount every lamp, battery and accessory back in against a checklist.
A tray on a workbench holding a headlamp, a small work light, a USB-C cable and a spare battery, a gloved hand setting the last item down.

How much runtime does your light need?

One charge covers a working day. The NWH20 gives 12 hours on its middle setting (300 lumens), measured at 26°C. The light gets dimmer as the battery drains. The NWL20 comes with its NL2150 battery and charges by USB-C in about 3 hours. Charge both at the bench.

Hours of light on one charge

hours

One working day: 8 h (our assumption, not a shift rule)
NWH20, middle setting (300 lumens): 12 h
NWH20, low setting (150 lumens): 17 h
NWL20, flood, middle setting (260 lumens): 10h20
NWL20, flood, brightest setting (600 lumens): 6 h
Working day Headlamp Work light

Nobody publishes lamp-on hours for a workshop job, so the 8 hour day is our assumption. The brightest settings step down as the lamp heats up.

How close you need to see

View from above an open engine bay with the technician's gloved hands at the bottom of the frame, a headlamp beam lighting a hose clamp and label, the far side of the bay fading into shadow. Arm’s length: your own hands 0.3 m: the label or clamp you are working on 0.6 m: the far side of the bay

Illustration, not a measured beam pattern.

What those distances look like

  • 0.3 m: about one school ruler
  • 0.6 m: about two rulers end to end

At this range you want the flood end of the NWH20’s beam, which lights the clamp and the hose around it. Bright bare metal bounces the beam back at you, so tilt the lamp or switch the beam to flood.

The NWH20 is neutral white (4,500 K). The EDC09 has three colour settings with stated colour rendering (CRI): 97 warm, 83 neutral and 73 cool. No portable light on this page replaces your workshop’s finish and colour-match lighting.

If the battery runs down, or the lamp fails

Battery runs down

Swap in a charged spare. The NWH20’s battery (WLB40) lifts out and a spare costs S$69. The NWL20 charges by USB-C.

Lamp fails, drops or goes missing

A second light with its own battery, such as the EDC09 or a torch you already own.

Practical checklist

  • Charge both lights at the bench. The NWH20 takes about 4 hours and the NWL20 about 3 hours on a phone adapter. No charger is in either box.
  • Lock the NWH20 in the toolbox: with it off, hold both buttons for 2 seconds and it flashes 3 times. To unlock, hold both for 2 seconds again.
  • Keep the NWL20’s magnet off painted panels and away from electronics unless your workshop says otherwise. The magnet holds to iron and steel.
  • We have not tested the controls with gloves. Try them with the gloves you wear.
  • Count every lamp and battery back in at the end of the job.

The kit we’d pack

NWH20 headlamp
Headlamp
NWH20 headlamp
S$119
  • The beam goes from spot to flood
  • 12 hours on the middle setting (300 lumens) on one charge
  • Neutral white (4,500 K), 149 g with battery
  • Handles heavy rain (IP66). Box includes the WLB40 battery, a headband, four hard hat clips and a USB-C cable
View product →
NWL20 work light
Work light
NWL20 work light
S$59
  • Pull-out hook and a magnet base that tilts 0 to 180 degrees
  • Flood 260 lumens for 10h20, or 600 lumens for 6 hours
  • 224 g with its NL2150 battery, charges by USB-C
  • Handles water jets (IPX5)
View product →
Headlamp and work light S$178

For a second light with its own battery, use the EDC09 or a torch you already own.

Already own a light? Check it against this list.

  • It reaches the recess behind the first hose.
  • You can wear it or hang it, so both hands stay free.
  • It lasts your working day on one charge.
  • It has a lock, so it cannot switch on in the toolbox.
  • You have a second light with its own battery.

Other lights that also work

EDC09 L-angle light
Three colours, clips on
EDC09 L-angle light
  • The head turns 102 degrees, and it clips on or stands on its magnetic base.
  • Neutral on its middle setting (180 lumens) lasts 2h45.
S$109
View light →
HC65 UHE headlamp
Brighter, swappable 18650
HC65 UHE headlamp
  • 400 lumens for 14 hours on the high setting. 152 g with its NL1840HP battery.
  • Handles water jets and immersion (IP68). A spare NL1840HP is S$59.
S$179
View headlamp → View spare battery →
WLB40 spare battery
Another 12 hours for the NWH20
WLB40 spare battery
  • The same battery that comes in the NWH20 box, so it fits directly. 64 g.
  • It adds power and does not fix a failed lamp.
S$69
View battery →

Runtimes measured at 26°C on the setting and battery listed.

What technicians describe

These are personal accounts, not endorsements of any product. Neither author used Nitecore gear, and the second author’s identity is unverified.

Questions

Can I use my phone torch?

Both hands are in the bay, so you cannot hold it. A headlamp or a hung light leaves them free.

Is this light certified for hazardous areas?

No. None of the lights on this page is certified for explosive atmospheres. The EDC09 manual says not to use it to illuminate flammable or explosive materials. Do not use any of them near fuel or solvent vapour.

Does the magnet damage paint or electronics?

The NWL20 magnet holds to iron and steel. We have no information on what it does to painted panels or electronics, so keep it off both unless your workshop says otherwise.

Which colour setting should I use to check paint?

None of these lights replaces your workshop’s inspection light. The same panel can look different under a different light, so judge colour under the lighting your workshop accepts. The colour figures are in how close you need to see.

How long does one charge last?

The NWH20 gives 12 hours on its middle setting, which covers an 8 hour working day. See the runtime chart for the other settings and the NWL20.

My workshop issues a light. Do I need this?

If it reaches the recess, keep it. Check it against the list in the kit section first.

What does this guide not cover?

The jobs listed in the job at a glance, and any workshop procedure. This is a guide to portable lights. Follow your workshop’s risk assessment.

Questions about your own gear? Contact the team.

Sources and credits

  1. Ministry of Manpower, Risk management, last updated 14 March 2024. mom.gov.sg
  2. SCANGRIP, detailing and colour match work lights catalogue: one colour can look different under another light. scangrip.com
  3. Mike Phillips, Auto Geek Online, SCANGRIP Sunmatch swirl finder light review, 14 December 2016. autogeekonline.net
  4. Reddit r/flashlight, headlamps for mechanics, excerpt captured 28 September 2026. reddit.com
  5. Nitecore, NWH20 manual and runtime tables. nitecore.com
  6. Nitecore, NWH20 product page. nitecore.com
  7. Nitecore, NWL20 manual. nitecore.com
  8. Nitecore, EDC09 manual. nitecore.com
  9. Nitecore, HC65 UHE manual. nitecore.com
  10. Nitecore Singapore, product and price snapshot, 6 October 2026. nitecore.sg

This is a buying guide for portable lights, not a workshop procedure. Follow your workshop’s risk assessment and the manufacturer’s service information. None of these lights is certified for hazardous atmospheres.

We have not tested these lights in a workshop.

Scene illustrations on this page were created for this guide and do not show a specific workshop.

Last reviewed 6 October 2026.