Poultry Lighting Programmes by Production Stage: Broiler, Layer and Breeder

A lighting quotation is usually a list of fixtures: wattage, mounting, ingress rating, a rated life in hours. A lighting programme is something else — it is a schedule. It says how many hours the lights are on, at what intensity, how the transitions between light and dark are handled, and how all of that changes as the flock ages.

The two get confused often enough that it is worth stating plainly: the same fixture can serve a broiler house, a layer house and a breeder house, but the three run programmes that have almost nothing in common. What changes between them is not the hardware so much as what the hardware is asked to do over time — and that, in turn, decides which specifications on the datasheet actually matter.

This piece sets out the three programmes side by side, then works backwards to what each one demands of the fixture. It is a companion to our poultry house lighting buyer’s guide, which covers the fixture side in more detail.

Why the programme, not the fixture, is the harder half

Two houses can be fitted with identical lights and get different results, because the programmes differ. That is not a marketing claim — it is the reason lighting programmes are published by breeding companies and, in the EU, partly written into law.

It also has an uncomfortable implication for suppliers, ourselves included. If the programme is where most of the effect sits, then a supplier who only talks about the fixture is talking about the smaller half of the problem. We would rather say that up front than let a specification sheet imply more than it should.

Broiler houses: a photoperiod that shortens, then lengthens

Broilers are grown to a fixed weight in a fixed number of days, so the lighting programme is built around feed intake and skeletal development rather than reproduction.

A typical modern broiler programme has three phases:

• Brooding (roughly day 0–7). Long daylength — often 23 hours of light — at high intensity, so chicks find feed and water. Intensity here is usually the highest the flock will ever see.
• Growing (from about day 7). Daylength steps down to introduce a defined dark period, and intensity is reduced. This is the phase that regulation constrains most.
• Finishing (final days). Daylength is often extended again to lift feed intake before depletion.

The regulatory floor matters here and is worth stating precisely. Under EU Directive 2007/43/EC, from seven days of age until three days before slaughter, houses must follow a 24-hour rhythm including at least 6 hours of total darkness, of which at least 4 hours are continuous, and light intensity must be at least 20 lux measured at bird eye level during the light period. That single requirement rules out the continuous or near-continuous programmes (23L, and short-cycle regimes such as 1L:2D) that were common before it came into force. Buyers outside the EU are not bound by it, but a great many of them specify to it anyway because their customers do.

Two consequences for the fixture:

1. Twenty lux is measured at the bird, not at the fixture. Lumen output at the housing tells you very little once you account for mounting height, spacing, house width and reflectance. Uniformity — the ratio of the darkest point to the brightest — decides whether the whole floor meets the floor value or only the area under each light.
2. The programme changes intensity daily, not seasonally. The fixture has to dim smoothly and repeatedly for the whole of its service life, which is a different demand from switching on and off.

Layer houses: a photoperiod that only ever increases

Layers run the opposite logic. The rearing period deliberately holds the birds back; the production period deliberately stimulates them.

• Rearing. Daylength is stepped down from the brooding period, and intensity is held low — published rearing guidance commonly sits in the region of 5–10 lux after about four weeks — to avoid stimulating the pullets too early and to reduce feather pecking.
• Photostimulation. At a point determined by body weight and uniformity as much as by calendar age, daylength begins to increase — typically in increments of about 30 minutes per week — until it reaches a target of roughly 14–16 hours.
• Production. Daylength is held. It is not reduced again, because reducing daylength in lay causes birds to go out of production.

The critical practical point is the ratchet: a layer programme can go up but it cannot come back down. A control system that loses its schedule, or a fixture that fails and is replaced with one whose dimming curve does not match, does not simply produce a slightly different light level — it can produce a step change in daylength that the flock reads as a signal.

There is a second point that gets missed in quotations. Rearing calls for low intensity, and low intensity is exactly where cheap dimming misbehaves: visible flicker, uneven output between fixtures on the same circuit, or a lower limit well above what the programme asks for. A fixture that dims cleanly from 100% to 20% and then behaves badly below that is fine for a broiler house and a poor fit for a pullet house.

Breeder houses: two flocks, one building, and the tightest tolerance of the three

Broiler breeders are the most demanding case, for three reasons.

First, the programme controls sexual maturity. Photostimulation is timed against body weight and flock uniformity, and moving it changes both the age at first egg and the size of that first egg — so the schedule is not a comfort setting, it is a production decision.

Second, males and females are on the same floor but are managed differently, which is why breeder houses more often need separate lighting zones or separately controlled circuits rather than one house-wide dimmer.

Third, breeder flocks are in the house far longer than broilers — often more than a year in lay. That extends the exposure of every fixture to ammonia, humidity, dust and washdown by a large multiple, and it is the reason a fixture that survives one broiler cycle tells you nothing much about how it will behave in a breeder house.

What the three programmes have in common — and what that asks of the fixture

Strip away the differences and the same four demands come back in all three cases.

1. Intensity is specified at the bird, so uniformity is the real specification. A quotation that lists wattage and lumens without a layout is not answering the question. What is worth asking a supplier for is a lighting layout with predicted lux at bird level for your house dimensions and mounting height, and the minimum-to-average ratio across the floor. Where the number in that layout is a calculated design figure rather than a measured one, it should say so.

2. Dimming has to be smooth, deep and repeatable. All three programmes change intensity as a routine operation, and two of the three spend significant time at low output. The useful questions are: what is the lowest stable output, is it flicker-free at that level, and do fixtures on the same circuit track each other as they dim? These are answerable with test data.

3. Flicker matters more than the datasheet usually admits. Birds have a higher flicker fusion frequency than people do, so a fixture that looks steady to an inspector may not be steady to the flock. This is covered in more detail in the buyer’s guide; the short version is that “flicker-free” on its own is a claim, not a specification, and the thing to ask for is a percentage flicker measurement across the dimming range.

4. Service life is set by the house, not by the diode. Ammonia attacks seals and solder joints, condensation tests an ingress rating that was measured once on a new fixture, dust holds heat against the driver, and high-pressure washdown puts thermal shock on hot components. We wrote about how this feeds into replacement cycles in what actually determines the payback period, and about how form factor interacts with all of it in matching the fixture to the house.

A short specification checklist you can send to any supplier

Send this to us and to whoever else you are quoting. Comparable answers are more useful to you than any single supplier’s brochure.

1. House type and stage — broiler, pullet rearing, layer production, or breeder — and the lighting programme you intend to run.
2. House dimensions, ceiling and mounting height, and system type (floor, cage or aviary).
3. Target lux at bird eye level, and the minimum-to-average uniformity you need across the floor.
4. Required dimming range, the lowest output you will actually operate at, and whether zones must be controlled separately.
5. Flicker percentage across the dimming range — measured, with the method stated.
6. Ingress rating, together with what the fixture is expected to survive: washdown pressure, chemistry and frequency.
7. Expected years in service before replacement, and what the supplier has actually seen come back from poultry houses.
8. Which figures on the specification sheet are measured results and which are design targets.

Point 8 is the one we would ask a supplier ourselves. On our own specification sheets, a figure that is a design target rather than a measured result is marked as a Target, and we supply the test report where one exists rather than rounding a published figure up. Where we do not yet have enough field time to answer a question honestly, we would rather say so than fill the gap.

Where we sit

FUJIAN YDJ LIGHT CO., LTD. manufactures LED lighting for poultry houses and horticulture, supplying distributors, integrators and own-brand customers. Our poultry and animal lighting range includes house fixtures such as the flicker-free poultry house fixture, and housing, optics, spectrum and packaging can be specified through our OEM / ODM capabilities.

What we can do usefully at the quotation stage is take the checklist above and answer it line by line for your house, including where the honest answer is that we do not have the data yet. Specification sheets and test reports are on the resources and downloads page, the full product catalogue is open with no registration, and if you would like a layout and a specification response for a specific house you can ask for a quotation.