Chicken Coop Light for Winter Laying

A chicken coop light keeps hens laying through winter by stretching the day to 14 to 16 hours, the range University of Arizona Extension gives for peak production. Put it on a timer, switch it on before sunrise and let the hens go to roost with the real sunset. This page covers the hours, the timing, the bulb and the mistakes that stop eggs instead of adding them. It is part of the winter coop guide.

Do chickens need light in the coop to lay in winter?

They need long days, and in most of North America winter days are too short. University of Arizona Extension calls the cold-weather explanation a misconception. It says light reaching the pineal gland drives the laying cycle, and that the shorter days of fall and winter cause the drop. Texas A&M AgriLife says the same: birds slow down in autumn because of light, not weather or feed, and the fix is one bulb on a timer.

UMaine Extension gives the threshold. It says 11 to 12 hours of light will start egg production but will not sustain it, and that the lights should come on when natural day length falls below 15 hours. In much of the northern US and Canada that happens by early fall.

A light is a choice, not a requirement. Hens that rest through winter are not sick. If you want eggs from November to February, though, the coop light is the tool extension services point to, and a heater is not. The chicken coop heater guide explains why heat on its own does not bring laying back.

How many hours of light do laying hens need?

Fourteen to sixteen hours a day, counting daylight. Here is what each source says, so you can see where they agree.

Sources checked October 24, 2026. The Penn State wattage figure dates from incandescent bulbs, so read it as a light level, not a power rating.

To work out your own schedule, look up your sunrise and sunset, subtract the daylight from 14 hours, and set the timer to switch on that much earlier than sunrise. Arizona’s own Flagstaff table, for example, has natural daylight of 9 hours 36 minutes in mid-December and switches the light on at 3:05 AM to reach 14 hours. Adjust the start time every couple of weeks as sunrise moves, which Arizona also recommends.

Swipe sideways to see the whole figure, or open it full size.

Should the light come on in the morning or the evening?

Morning. Arizona says the added light should ideally come entirely before sunrise so hens can roost with the natural sunset. If you add light after sunset, it says the light must dim gradually over 30 to 45 minutes. Hens have poor night vision and need a gentle change to find the roost. UMaine notes the same trade-off: morning-only light lets birds go to roost naturally, and a split schedule saves a little electricity but needs a dimmer.

UMaine also points out the cost of an early start. Lights at 5 AM mean someone has to bring fresh water early. It says hens should not go more than an hour without a drink after the lights come on. The keep chicken water from freezing guide helps with that part.

How bright should a chicken coop light be?

Brighter is not better. The extension figures are modest: Arizona and UMaine both put one 9 watt LED, about the light of a 60 watt incandescent, at roughly 200 square feet of floor. UMaine’s lumen table puts a 60 watt incandescent at a minimum of 800 lumens. UMaine says the target is about 1 foot-candle at the height of the feed trough, and that if hens seem nervous and flighty, a smaller bulb can calm them.

Color matters more than watts. Arizona, UMaine and Texas A&M all say to use a warm, red-orange bulb rather than a cool white one. Warm light does more to stimulate laying. Texas A&M says to hang the light above feeders and waterers and to keep the nest boxes unlit, while avoiding dark corners that invite floor laying. UMaine suggests a dark curtain over nest box entries. The nesting box dimensions guide covers where boxes go so they stay dim.

Keep the bulb clean. UMaine says dusty bulbs lose a real amount of light and suggests wiping them every month, and Arizona says the same. In a coop, dust builds up fast.

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Plug-in light with a timer or a solar coop light?

A plug-in light on a timer is the setup every source above describes. UMaine calls an automatic timer “really a necessity” and says to check it weekly. Penn State says an inexpensive time clock can turn the lights on in the morning. What matters is that the day length is the same every day.

Solar coop lights with built-in timers are sold for coops without power. No extension source in this research tests them. Before buying one, check the maker’s own specs for battery capacity, panel size and timer modes, and compare the panel’s position with your winter sun. Arizona and UMaine both say a missed day of light can drop production, and a solar battery that runs flat in a cloudy week does exactly that. The solar door guide explains why winter shade and short days are hard on small solar panels.

If you run power to the coop, do it properly. UMaine says to make sure wiring meets safety and local codes before installing any fixture. The chicken coop heater guide covers outlets and cords for coops.

Mistakes that stop eggs instead of adding them

Cutting the day short is the big one. UMaine says laying birds must never see a drop in day length: forget the lights for one day and production can fall, and a power cut of two days or more can push birds into a molt that affects laying for up to six weeks. Arizona says abruptly stopping or starting a program, or missing a day or two, can cause a temporary drop or a molt lasting 6 to 8 weeks.

Too much light is the next. Arizona says not to leave lights on around the clock, and that more than 16 hours of light does not stimulate more eggs. Manitoba Agriculture says not to give laying hens more than 16 hours of daylight, so they stay calm while forming shells at night.

Lighting young birds is the third. Arizona says pullets should be on naturally declining light from 8 to 20 weeks, because early laying can lead to prolapse and smaller lifetime production. It says to restart lighting when pullets reach 18 weeks and to add only 15 to 30 minutes a week until you reach 14 hours. UMaine says jumps from 10 hours of light to 13 in a single day confuse the birds and recommends 15 minute weekly steps.

Using a heat lamp as the light is the last. Arizona says a heat lamp is unnecessary in a coop that protects birds from the weather and that heat lamps carry a large fire risk. UMaine adds that a heat lamp left on 24 hours reads to hens as continuous daylight, so turning it off in spring looks like a shorter day and can cut laying. The heating a chicken coop guide covers whether you need heat at all.

Does a coop light keep chickens warm?

No, and it should not try to. A 9 watt LED makes almost no heat, which is the point. Cold tolerance comes from dry air, no drafts and deep bedding, which the how cold is too cold for chickens guide and the ventilation guide cover. If you decide to add heat, keep it separate from the light so you can switch the heat off in spring without changing the day length.

Written by Kyle

Kyle has kept backyard chickens on his own small farm for five years. He reads the extension research, the spec sheets and the owner complaints, then tells you what he would buy and what he would skip.

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