LED Lights for Poultry Farms: Retrofit Bulb, 48V Linear or Sealed Disc — Matching the Fixture to the House

Search for an LED light for a poultry farm and you get a wall of fixtures that all look broadly similar: a sealed body, a diffuser, an IP number, a wattage. What the listings rarely tell you is the thing that actually decides whether a fixture will work — the house it is going into.

A cage layer row, a broiler floor house and a multi-tier aviary are three different lighting problems. They differ in mounting height, in how the light has to be aimed, in how often the fixture gets washed, and in whether there is existing wiring to reuse. A fixture that is excellent in one of them can be the wrong purchase in another, at any price.

This article works the decision in that order: house first, then fixture form factor, then the specifications that separate a fixture that survives five years from one that does not. It is the selection-level companion to our complete buyer’s guide to poultry house lighting, which covers the wider programme — photoperiod, welfare rules and spectrum.

1. Start with the house, not the fixture

Before comparing products, write down five things about the building. Every serious supplier will ask for them, and the ones who do not ask are quoting blind:

• Bird type and stage — broiler, pullet, layer, breeder, brooding.
• House geometry — length, width, and mounting height available above the birds.
• Housing system — floor, cage rows, multi-tier aviary, slat-and-litter.
• Existing electrical infrastructure — are there lamp holders on a dimmer circuit already, or is this a new low-voltage run?
• Cleaning protocol — dry brush-down, low-pressure rinse, or high-pressure washdown with detergent between flocks.

The last two are the ones buyers most often leave out of an enquiry, and they are the two that most often decide the form factor.

2. The three fixture types that cover most poultry houses

Almost every poultry lighting product on the market is a variation on three shapes. Each exists because of a specific constraint.

Retrofit bulbs (E26/E27). A lamp that screws into holders that are already there. The whole reason this format exists is that a very large share of existing poultry houses were built with lamp holders on a dimmable circuit, and replacing the lamps is a one-shift job with no rewiring, no new conduit and no electrician on site for days. The constraint it solves is disruption, not performance. Our retrofit LED bulb kit is built for exactly this case: existing holders, standard or custom spectrum. Dimming is specified per project rather than included as standard.

Connectable linear fixtures. A slim bar that links end to end along a run, usually on low-voltage wiring. This shape exists because cage rows and aviary tiers are long, narrow spaces where light has to reach down a corridor between structures rather than spread from a point. Point sources above a cage row throw hard shadows into the lower tiers; a continuous line does not. Our 48V connectable linear light is intended for cage and aviary rows.

Sealed disc lights. A low-profile sealed body, typically low-voltage, mounted overhead in open-floor houses. The shape exists to survive: no screw thread to corrode, no lamp holder to trap moisture, a single sealed unit that can take a washdown. It is the format that suits broiler, pullet and brooding houses where the fixture is exposed and the cleaning is aggressive. Our 48V sealed disc light sits here.

The three are not tiers of quality. They are answers to different questions.

3. Matching form factor to house type

If your house does not obviously match a row, that is normal and it is a reason to ask for a layout rather than a product list.

4. Voltage is a specification decision, not an installation detail

The retrofit format runs on mains AC. The linear and disc formats in most modern poultry ranges run on 48V DC from a central driver or control box. Buyers often treat this as an installer’s concern. It is not — it changes the system.

Low-voltage DC at 48V is extra-low voltage, below the threshold where contact is a shock hazard, which matters in a building that gets hosed down and where staff work around the fittings wet. It also behaves better over the long wiring runs a poultry house needs, because voltage drop over distance is easier to manage when the dimming is handled centrally rather than at each lamp. And it moves the driver — the component most likely to fail — out of the corrosive part of the building and into a control box you can reach.

The trade-off is real: a 48V system means new wiring and a control box, so it is a natural fit for a new build or a full refit, and a poor fit for a “swap the lamps this week” job. That is the actual retrofit-versus-low-voltage decision, and it is worth making explicitly rather than inheriting it from whichever product you looked at first.

5. Uniformity decides bird behaviour more than peak output

This is the specification that gets least attention in a quote and causes most of the problems afterwards.

Birds move toward light. If one end of a house is brighter than the other, birds crowd there — which shows up as uneven feed and water use, uneven growth, and litter problems in the crowded area. Industry guidance is to keep variation across the house under about 20%, and intensity is measured at bird eye level, not at the ceiling and not with a phone app held at chest height.

The EU broiler directive (2007/43/EC) puts a floor under this for member states: at least 20 lux during light periods, measured at bird eye level, illuminating at least 80% of the usable area. Even outside the EU it is a useful benchmark to design against, because it forces the conversation to be about coverage rather than about the wattage on the box.

Practically, this means a quote for a poultry house should include spacing and a layout, not just a fixture and a quantity. Fixtures are normally staggered rather than gridded, and positioned in relation to the feeder and drinker lines, because that is where you want birds active. A supplier who cannot tell you the spacing they assumed has not designed anything — they have priced a box.

One more thing worth building into the design: light output falls over the life of the installation. Designing to the exact minimum on day one means falling under it later.

6. What “dimmable” has to mean in a poultry house

Almost every fixture is described as dimmable. In a poultry house the word has to mean considerably more than “it gets darker”.

• It has to talk to the house controller. Most commercial houses run lighting from the environmental computer, commonly on a 0–10V control signal. A lamp that only dims from its own wall dimmer does not integrate.
• It has to ramp, not step. Sunrise and sunset simulation exists to avoid the sudden transitions that startle a flock. A fixture that jumps in visible steps defeats the purpose.
• It has to dim deep and stay stable at the bottom. The low end of the range is where brooding programmes and dusk simulation live, and it is where cheap drivers become unstable, flicker, or simply cut out.

When comparing quotes, ask for the dimming range as a percentage and the control protocol by name, and ask specifically what happens at the bottom of the range. “Dimmable 0–100%” on a datasheet and stable behaviour at 5% output are not the same claim.

7. IP rating is necessary but not sufficient

An IP rating describes protection against solids and water. It says nothing about ammonia.

That distinction matters because ammonia is continuously present in a poultry house and attacks materials over time — it is a chemical exposure, not an ingress one. A fixture can be genuinely sealed against a pressure washer and still degrade because of what the housing, gaskets and external fasteners are made of. Corrosion at fasteners and brackets is one of the most common ways an otherwise good fixture fails in this environment.

So specify both:

• Ingress: an IP rating matched to how the house is actually cleaned. Dry brush-down and high-pressure washdown are different requirements, and specifying for the harder one costs little at purchase and a lot to fix later.
• Chemistry: what the housing, lens, gaskets and — importantly — the external screws and brackets are made of, and what the supplier’s evidence is for ammonia exposure over time.

Ask for the second one in writing. It is a question most catalogue listings do not answer, and the answer tells you a lot about whether the supplier has actually deployed in poultry houses or is selling an industrial fixture into one.

8. Flicker: ask a better question than “is it flicker-free?”

“Flicker-free” is a marketing phrase, not a specification, and by itself it is unverifiable.

The underlying concern is real. Chickens process visual information faster than humans do. Behavioural work puts the critical flicker fusion frequency for chickens in roughly the 75–90 Hz range, and electroretinogram studies show responses persisting above 100 Hz — meaning modulation a person in the house cannot see may still be visible to the birds. This is why the topic is treated as a welfare and performance question rather than a comfort one.

What makes the claim testable is asking for numbers instead of adjectives:

• the driver’s operating frequency;
• the percent flicker (modulation depth) at dimmed output, not only at full output — dimming is where flicker typically appears;
• and a measurement report, not a statement.

If a supplier can produce a flicker measurement at 10% dimmed output, you have learned something. If the answer is a logo on a datasheet, you have not. We apply the same standard to our own range: where a figure is a design target rather than a measured result, we say so, and we will send the test report when it exists rather than printing an unverified number.

9. What to send so quotes are actually comparable

Most quote sets cannot be compared because each supplier assumed something different. Sending the same package to everyone fixes it. Include:

1. Bird type and production stage.
2. House dimensions and available mounting height.
3. Housing system and, for cages or aviaries, the number of tiers.
4. Existing wiring: lamp holders on a dimmer, or a new low-voltage run.
5. The house controller and its dimming signal.
6. Target intensity at bird level and the photoperiod programme you run.
7. Cleaning protocol and chemicals.
8. Certification required in your market.
9. Annual volume and timeline.

Then ask every supplier for the same three things back: a layout with spacing, the predicted intensity at bird level and its uniformity, and the test evidence behind any performance claim. Quotes that answer those three are comparable. Quotes that give you a unit and a number are not.

10. Where YDJ fits

We manufacture across all three form factors, so we have no reason to push you toward one: a retrofit LED bulb kit for houses with existing holders, a 48V connectable linear light for cage and aviary rows, and a 48V sealed disc light for broiler, pullet and brooding houses. The full range sits in our poultry and animal lighting category, and the system-level view is on our poultry farm lighting solution page.

Where published wattage, CRI or luminous flux figures are design targets rather than measured results, our specification sheets mark them as targets. Ask us for the test report — that is the standard this article argues you should hold every supplier to, including us.

For distributors and integrators building an own-brand poultry line, spectrum, housing, driver selection and packaging can be specified to your requirement; see our OEM and ODM capabilities.

Browse the full product catalogue, or send us your house details using the nine points in section 9 and we will come back with a layout, a predicted intensity at bird level, and what we can and cannot yet evidence.