A halogen work lamp remains a viable purchase in 2026 where the lamp count is low, the use is occasional, and the unit cost matters more than the operating cost. A typical 55W H3 halogen work lamp produces 1,450 lumens, costs GBP 8 to GBP 25, lasts 500 to 1,500 hours, and accepts a replacement bulb in 2 minutes with no special tools. The buying decision depends on bulb code, wattage, beam pattern, size, mounting position, and ingress protection rating. This guide covers the halogen bulb codes used in agricultural and commercial work lamps, the wattage and lumen output to expect, the beam patterns available, the form factors on the market, and the best picks by application from front fender stalk to combine perimeter mount. For the technology question of halogen versus LED at a fundamental level, see the halogen work lights technology guide.
What to Look for in a Halogen Work Lamp
A halogen work lamp specification combines 6 key attributes: the bulb code (which determines the replacement bulb you will need to buy), the wattage (which sets current draw and brightness), the lumen output (the actual light produced), the beam pattern (flood, spot, or combo), the housing form factor (round or rectangular, sealed or open-back), and the ingress protection rating (IP67 minimum for tractor use).
A halogen work lamp differs from a halogen headlamp in 3 ways. The work lamp uses a free-form or stippled reflector designed to spread light across an area, not aim a beam at the road ahead. The work lamp lens is usually clear without cut-off optics. The work lamp is not E-marked for road use as a forward driving lamp, so it cannot replace a headlamp on a road-legal vehicle.
The biggest specification mistake on a halogen work lamp purchase is buying purely on wattage. A high-wattage lamp with a poor reflector produces less usable light than a moderate-wattage lamp with a quality reflector. Check the lumen output (the measurable light produced) rather than the wattage (the power drawn) wherever the manufacturer publishes it.
Common Halogen Bulb Codes in Work Lamps
A halogen work lamp uses 1 of 5 common bulb codes, each with a defined base type and filament arrangement. The bulb code determines the replacement bulb you need to keep in the spares box and the connector type the lamp uses.
| Bulb code | Wattages | Base type | Common use |
|---|---|---|---|
| H1 | 55W, 70W, 100W | P14.5s single-pin | High-output spot work lamps |
| H3 | 55W, 70W, 100W | PK22s with flying lead | Most agricultural work lamps |
| H7 | 55W, 100W | PX26d two-pin | Larger rectangular work lamps |
| H9 | 65W | PGJ19-5 | High-output combo and spot |
| H11 | 55W | PGJ19-2 | Modern rectangular work lamps |
H3 Is the Agricultural Standard
A H3 55W halogen bulb is the most common work lamp bulb on UK tractors, combines, telehandlers, and trailers. The H3 has been the de facto standard since the 1980s because the small package, the flying-lead connection, and the wide availability suit the compact round work lamp housings that dominate the agricultural market. A box of 10 H3 55W bulbs costs GBP 25 to GBP 50 and lasts a typical farm 12 to 24 months of routine replacement.
H1 for Spot Work Lamps
A H1 halogen bulb sits in a single-pin base and uses a transverse filament that suits parabolic spot reflectors. A H1 70W work lamp in a 200mm round housing throws a usable beam to 60 to 80 metres against 30 to 40 metres for the same wattage H3 in a flood housing. Long-throw applications (yard, perimeter scanning, telehandler boom-tip) often use H1 for this reason.
H7 and H11 in Rectangular Housings
A H7 55W or 100W bulb fits larger rectangular work lamps typically 200mm wide or larger. The H11 55W bulb is functionally similar but uses a slightly different base. Both are common on European agricultural fitments where rectangular work lamps mount to combine bodywork, sprayer booms, or telehandler cabs.
H9 for High-Output Combo
A H9 65W halogen bulb produces approximately 2,100 lumens against 1,450 lumens for H3 55W. The H9 is designed for high-beam-only forward driving lamps but is also fitted to high-output halogen work lamps for users who need the extra output without moving to LED.
Wattage and Lumen Output for Halogen Work Lamps
A halogen work lamp converts approximately 8% of input power into visible light, with the remaining 92% lost as heat. The table below shows typical lumen output for common bulb wattages.
| Bulb / wattage | Typical lumen output | Current draw at 12V | Current draw at 24V |
|---|---|---|---|
| H3 55W | 1,450 lumens | 4.6 amps | 2.3 amps |
| H3 70W | 1,750 lumens | 5.8 amps | 2.9 amps |
| H3 100W | 2,500 lumens | 8.3 amps | 4.2 amps |
| H1 55W | 1,550 lumens | 4.6 amps | 2.3 amps |
| H1 70W | 1,750 lumens | 5.8 amps | 2.9 amps |
| H7 55W | 1,500 lumens | 4.6 amps | 2.3 amps |
| H7 100W | 2,400 lumens | 8.3 amps | 4.2 amps |
| H9 65W | 2,100 lumens | 5.4 amps | 2.7 amps |
Lumen Output by Working Distance
A 1,450-lumen H3 55W halogen work lamp illuminates a working area of approximately 5 to 10 metres at usable brightness for close work. A 2,500-lumen H3 100W lamp reaches 10 to 15 metres. A 2,100-lumen H9 65W in a spot housing reaches 20 to 30 metres. The tractor work light lumens guide covers the lumen-to-distance relationship in detail for both halogen and LED.
Power Draw on Multi-Lamp Installations
Four H3 55W halogen work lamps on a 12V tractor pull 18.4 amps continuously. The same lamps on a 24V system pull 9.2 amps. A standard 12V tractor alternator at 65A handles the load with margin, but the install needs a 25A or 30A relay and a 20A inline fuse. The how to wire work lights to a 12V system guide covers the wiring procedure.
Beam Patterns: Flood, Spot, and Combo Halogens
A halogen work lamp uses 1 of 3 beam patterns depending on the reflector and lens design. The pattern determines how the light spreads and how far the beam reaches.
A flood halogen work lamp spreads light across a wide arc of 60 to 120 degrees with most output concentrated within 5 to 15 metres of the lamp. The reflector is typically free-form (computer-designed for even spread) or stippled (cast with surface texture that scatters the light). Flood patterns suit close fieldwork, loading bays, coupling areas, and yard work where the operator needs broad illumination of the immediate area.
A spot halogen work lamp focuses light into a narrow 8 to 30-degree cone that reaches 30 to 80 metres depending on bulb wattage. The reflector is parabolic (curved to collimate the light into parallel rays) with a clear lens. Spot patterns suit long-throw applications including yard perimeter scanning, telehandler boom tip lighting, and rear-of-trailer illumination at distance.
A combo halogen work lamp combines both optic types in a single housing, typically with the spot element above and the flood element below or with the two sharing a split reflector. Combo halogens are less common than dedicated flood or spot units because the design compromises both functions. Most operators buy separate flood and spot lamps rather than combo halogens.
The work light beam patterns guide covers the optics decision in full, with beam-distance charts for each pattern type.
Size and Form Factor: Round and Rectangular
A halogen work lamp comes in 2 dominant form factors. The choice depends on the mounting position, the original equipment shape, and the visual match required.
| Form factor | Common sizes | Typical bulb | Use |
|---|---|---|---|
| Round | 90mm, 120mm, 140mm, 165mm, 200mm | H3, H1 | Stalk-mount, fender, A-pillar |
| Rectangular | 150 x 80mm, 200 x 100mm, 240 x 120mm | H3, H7, H11 | Cab roof, combine, sprayer body |
| Compact round (under 90mm) | 65mm, 70mm | Single H3 or smaller miniature | Cab interior, marker positions |
| Large rectangular | 280 x 140mm | H7, H9 | Combine perimeter, sprayer boom |
Round Halogen Work Lamps
A round halogen work lamp in 90mm to 140mm typically uses a single H3 55W or 70W bulb. The compact size suits stalk mounting on tractor fenders, A-pillar mounting alongside the cab, and bumper-bar mounting at the front. A 200mm round halogen often takes a H1 70W or 100W bulb for higher output in a spot pattern.
Rectangular Halogen Work Lamps
A rectangular halogen work lamp typically uses a H3, H7, or H11 bulb depending on size. The rectangular form factor suits factory mounting positions on combine bodies, sprayer booms, telehandler cab roofs, and tractor cab rear corners where the rectangular silhouette matches the OEM design language. Rectangular halogens often have a wider flood spread than equivalent round flood lamps because the lens area is larger.
Mounting Options and IP Rating
A halogen work lamp mounts to a vehicle using 1 of 4 common bracket types: bolt-through (a single stud through the base), swivel bracket (a U-shaped frame allowing rotation), stalk mount (a vertical post for elevated positioning), and direct surface mount (the lamp body bolted flat to a panel). The mount choice depends on the position, the orientation, and the vibration exposure.
IP Rating for Halogen Work Lamps
A halogen work lamp fitted to a tractor, combine, sprayer, or trailer must meet IP67 (dust-tight, immersion to 1 metre for 30 minutes) as a minimum. A pressure-washed vehicle benefits from IP69K (high-pressure, high-temperature water spray resistance) but most halogen work lamps top out at IP67 because the bulb-replacement gasket cannot reliably seal to IP69K standards. The IP67 vs IP69K guide covers the test standards in full.
Vibration and Bulb Life
A halogen bulb on a vibrating mount lasts 30 to 50% less than the same bulb on a rigid mount because filament shock breaks the tungsten wire. A rubber-isolated bracket or a stalk mount with a flexible base extends bulb life on agricultural applications where vibration is constant. The how to mount work lights guide covers the mounting decision and the vibration considerations.
Best Halogen Work Lamps by Application
A halogen work lamp choice depends on the application. The recommendations below cover the common UK agricultural and commercial use cases.
Front Fender Stalk on a Compact Tractor
A 90mm or 120mm round H3 55W halogen work lamp on a swivel bracket suits front fender stalk mounting on a compact utility tractor (Kubota L-series, John Deere 3 series, Massey Ferguson 1700 series). Total cost GBP 10 to GBP 25 per lamp.
Tractor Cab Roof Rear Corner
A 120mm or 140mm round H3 70W halogen work lamp on a bolt-through mount suits cab roof rear corner mounting on a mid-size tractor (John Deere 6R, Massey Ferguson 6700, New Holland T6). Total cost GBP 15 to GBP 30 per lamp.
Combine Harvester Perimeter
A 200mm round H1 70W spot halogen or a 240 x 120mm rectangular H7 55W flood halogen suits combine perimeter lighting (Claas Lexion, John Deere S700, New Holland CR). The original equipment is typically halogen on combines built before approximately 2014. Total cost GBP 20 to GBP 40 per lamp.
Telehandler Boom Tip
A 90mm round H1 55W spot halogen on a swivel bracket suits telehandler boom tip mounting (JCB Loadall, Manitou MT, Merlo P-series). Total cost GBP 12 to GBP 25 per lamp.
Trailer Loading and Coupling
A 120mm round H3 55W flood halogen on a magnetic mount suits temporary trailer loading and coupling lighting. Total cost GBP 15 to GBP 30 per lamp including magnet base.
Where to Buy Halogen Work Lights in the UK
A halogen work lamp is available through agricultural lighting suppliers, commercial vehicle parts retailers, and general accessory stockists. Agri Lighting holds UK stock of halogen work lamps from 55W to 100W, round and rectangular form factors from 90mm to 280mm, flood and spot beam patterns, and IP67-rated housings with bulb codes covering H1, H3, H7, H9, and H11. Same-day dispatch applies to orders placed before 3pm.
For the technology decision between halogen and LED, see the halogen work lights technology guide and the LED vs halogen tractor lights comparison. For LED alternatives at similar price points, see LED work lights. Browse the full work lights category for current halogen and LED stock.
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