卵生産のための鶏小屋の照明
冬になり日照時間が短くなると、鶏の産卵数が減っていませんか?そんな悩みを抱えているのはあなただけではありません。日照時間が短くなると、鶏の体内時計に「産卵数を減らす時期だ」という信号が送られます。でも、朗報があります。この自然な産卵数の減少は永久的なものではなく、産卵に適した鶏小屋の照明を設置すれば、完全に改善できるのです。
このガイドでは、高価な機器や複雑な配線を必要とせずに、理想的な日光環境を模倣した照明システムを構築する方法を学びます。以下の点を習得できます。
✅卵の生産を最大限に高める、科学的に証明された光の持続時間、明るさ、スペクトル
✅今日から実践できる、鶏小屋の照明設定のステップバイステップガイド
✅一貫した結果を得るための最高の赤色スペクトル LED ライトとタイマーシステム
✅鶏が一年中産卵し続けるための季節ごとの照明計画
文字通り、あなたの群れの生産性をピークに戻す方法を明らかにしましょう。

目次
光は鶏の卵生産をどのように制御するのでしょうか?
冬になると、鶏が突然卵を産まなくなることはありませんか?それは鶏が病気や寒さのせいではなく、鶏の体が温度ではなく光に反応しているからです。
鶏は光に敏感な動物です。日照時間が約12時間以下になると、鶏の体内時計は産卵を遅くしたり、完全に停止したりする信号を送ります。これは自然な生存本能ですが、安定した産卵量に頼る場合には問題となります。
良いニュースは?このスイッチを制御できるということです。
毎日適切な量の人工光を提供することで、飼料、品種、または住居を変更せずに、最も暗い月でも鶏が正常に産卵し続けることができます。
1日あたり14〜16時間の光を与えるだけで、 1〜2週間以内に産卵を再開できます。
大規模な納屋の改修は必要ありません。適切な光の持続時間、明るさ、スペクトルだけが必要です。
結果は実証済みです。農場では照明を適切に管理することで、一貫して卵の生産量が 15~30% 増加しています 。
次に、光が鶏の生殖器系を活性化する仕組みを科学的に分析し、この方法がなぜ機能するのかを正確に理解しましょう。
光が産卵に影響を与える理由― 科学的に解説
鶏にとって、光は単なる視認性の問題ではありません。それは、彼らの生殖システムを制御するマスタースイッチなのです。照明が産卵促進にこれほど効果的に作用する理由を理解するには、鶏が光をどのように認識し、体がどのようにホルモン反応を起こすのかを解明する必要があります。
1. 光周期と鶏の体内時計 – 14~16時間が最適な理由
鶏は光周期動物であり、体は日照時間の変化に反応します。自然界では、鶏は日照時間が長い春と夏に産卵量を増やし、日照時間が短くなる秋と冬には産卵を止めます。
しかし、なぜ正確に14〜16時間の光が必要なのでしょうか?
12 時間未満 → 鶏は「休息モード」に移行し、卵を産む代わりにエネルギーを節約します。
14~16時間 → 光は生殖器系を完全に活性化するのに十分な強さです。
16 時間以上 → 余分な卵は産まれず、過剰な光によりストレスや羽つつきが発生する場合があります。
この 14 ~ 16 時間の光サイクルは雌鶏の体内時計と同期し、繁殖に最適な季節であることを雌鶏の体に知らせます。
2. 光 → 脳 → ホルモン → 卵子
卵生産を支える養鶏照明の科学は、光が鶏の目だけでなく脳内の特殊な光受容体に到達することから始まります。その連鎖反応を簡略化して示すと以下のようになります。

ステップ 1: 光は目と頭蓋骨から入ります。
鶏は網膜と薄い頭蓋皮膚の両方を通して光を感知できます。
ステップ 2: 視床下部の活性化
光は、生殖などの生物学的機能の調整を担う脳の一部である視床下部を刺激します。
ステップ 3: 下垂体がホルモンを放出します。
視床下部は下垂体に 2 つの重要な生殖ホルモンを放出するよう促します。
FSH(卵胞刺激ホルモン)– 卵胞を刺激して卵黄を成長させる
LH(黄体形成ホルモン)– 排卵と卵子の放出を誘発する
ステップ 4: 卵子の生産が始まる
卵黄が成熟すると、卵管を通って移動し、卵白、膜、殻が形成され、約 24 ~ 26 時間ごとに 1 個の卵子が生産されます。
✅ このプロセスは、毎日一貫して十分な時間光にさらされた場合にのみ継続されます。
3. 冬に鶏が産卵をやめる理由
冬には、卵の生産に不利に働く 2 つの主な環境要因があります。
冬の要因 | 鶏への影響 | 結果 |
日照時間が短い(12時間未満) | 視床下部は光を十分に受けない | FSHとLHの産生が減少する |
寒い気温 | 鶏の体は暖かさと生存を優先する | 卵形成に必要なエネルギーが少ない |
自然な季節の本能 | 鶏は繁殖のためではなく健康のために栄養を蓄える | 産卵が遅くなったり止まったりする |
When daylight drops below 12 hours, hormone levels decline, follicles stop developing, and egg output decreases dramatically.
But this is not a permanent biological shutdown — it’s simply a response to light loss. With artificial lighting that restores 14–16 hours of consistent light, hormone activity resumes, and the laying process restarts naturally.
4. What Research and Production Indicators Show
Studies on chicken coop lighting reveal practical effects on production, presented here as actionable takeaways for farmers and backyard keepers:
Indicator | Key Takeaways for Egg Producers |
Average Egg Production Rate | Consistent 14–16h light helps maintain higher production. Over months, daily laying stays more stable compared to natural light alone. |
Average Egg Weight | Egg weight may slightly decrease if light exposure increases but diet is unchanged. Ensure sufficient protein and calcium to maintain optimal egg size. |
Soft Egg Rate | Gradual, stable light reduces soft-shelled eggs. Red-spectrum light is especially effective in minimizing shell defects. |
Egg Breaking Rate | Evenly distributed LED lighting lowers breakage by reducing stress and crowding around feeders or nest boxes. |
Practical Tip: Pair proper lighting with balanced nutrition and gradual light transitions to maximize egg output and maintain egg quality.
The Three Pillars of Productive Chicken Coop Lighting
To boost egg production, poultry lighting must go beyond simply “turning on a bulb.” Three elements determine whether your flock lays consistently year-round: light duration, light intensity, and light spectrum. Get these right, and most hens will resume laying within 7–14 days.

1. Light Duration – Maintain 14–16 Hours of Light Every Day
Light duration (also called the photoperiod) is the most critical factor for triggering egg production. Hens need 14–16 hours of continuous light daily to keep their reproductive hormones active.
✅ Why Consistency Matters
Light must be added gradually—no sudden jump from 8 to 16 hours.
Abrupt changes can confuse the hen’s biological clock, causing stress, feather loss, or a complete stop in laying.
The recommended method is to increase light by 30 minutes per week until reaching 14–16 hours.
✅ Why You Need an Automatic Timer
Keeping a manual schedule is nearly impossible—missing even a single morning or evening light session can reset the hen’s internal clock.
➡ Recommended solution:
“This is where an automatic controller, like the Ceramiclite IDS Controller, becomes essential. It delivers precise daily lighting schedules—turning lights on and off at the exact time, without you lifting a finger.”
2. Light Intensity – 5–10 Lux Is All You Need
Hens don’t need bright, harsh light. In fact, too much light can cause stress and aggression. Research shows that 5–10 lux—roughly the brightness of early morning sunlight—is ideal for egg production.
✅ What Is Lux?
Lux measures how much visible light reaches a surface.
5 lux = a dim hallway
10 lux = soft indoor lighting
✅ How to Measure Lux in Your Coop
You don’t need a laboratory tool—just a smartphone and a free light meter app.
Stand at the height of the chickens' heads.
Check several spots—nesting area, perches, corners.
Aim for even coverage with no dark shadows or bright glare.
✅ Best Lighting Fixtures for Even Coverage
➡ “To achieve shadow-free, balanced lighting across the coop, we recommend using D80 LED Light Bulb and T5 LED Barn Light. Their wide beam angle, low glare, and stable output make them ideal for poultry environments.”
D80 LED Light Bulb T5 LED Barn Light
3. Light Spectrum – Red Light Stimulates More Egg Production
Not all light colors affect hens the same way. Red light (620–750 nm) has been proven to stimulate the reproductive system more effectively than blue or cool white light.
✅ Why Red Light Works
Red wavelengths penetrate deeper through the skull, reaching the hypothalamus.
This stimulates the pituitary gland to release more FSH and LH hormones, which are essential for egg production.
Red light also reduces melatonin levels (the sleep hormone), keeping hens active and laying.
✅ Red vs. White vs. Blue Light
Light Type | Effect on Hens | Recommended? |
Blue Light | Calming, reduces movement | ✔ For brooders, ✖ Not for egg production |
White Light (Cool/Neutral) | General visibility, moderate effect on laying | ✔ Acceptable |
Red Light (620–750 nm) | Strong stimulation of reproductive hormones, reduces stress | ✅ Best for egg production |
✅ Recommended Product
➡ “For optimal laying performance, use the Ceramiclite D80 LED Bulb (Red Spectrum). It delivers a scientifically calibrated red wavelength that supports egg production while keeping hens calm and comfortable.”
Step-by-Step Chicken Coop Lighting Setup Plan
To turn lighting into real egg production—not just bright barns—you need a structured setup. This chapter walks you through everything: choosing the right fixtures, installing them correctly, and automating the light cycle for consistent egg laying.
✅ Step 1: Calculate Coop Size & Select the Right Fixtures
Different coop sizes and ceiling heights require different lighting fixtures and quantities.
Coop Size | Area | Recommended Fixture | Quantity (per 10 m²) | Notes |
Small | < 10 m² | Ceramiclite T5 LED Tube | 1–2 units | Low ceiling, easy wiring |
Medium | 10–30 m² | Ceramiclite T8 LED Tube | 2–4 units | Most backyard coops |
Large | 30–60 m² | T8 + T5 combination | 4–6 units | Avoid dark corners |
Large Barn / High Ceiling | >60 m² or >3 m height | Ceramiclite T21 LED Barn Light | 1 unit per 20–25 m² | Better brightness and coverage |
Why T21 for barns?
It provides higher lumen output, wider light spread, and works better for coops with higher ceilings (>3 m), ensuring light reaches the floor and nesting areas.
| LED Barn Light T5 | LED Barn Light T8 |
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| LED Light Bulb D80 | LED Barn Light T21 |
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✅ Step 2: Optimal Light Placement & Mounting Height
Goal: Uniform light distribution with no shadows or dim areas.
Setup Element | Recommendation |
Mounting Height | 2–2.5 m in small/medium coops; 3–4 m in barn-style houses |
Layout Style | Linear rows for narrow/coffin-style coops; grid layout for large barns |
Spacing Between Lights | 1.5–2 m between T5/T8 tubes; 3–4 m between T21 fixtures |
Avoid | Direct light into chickens’ eyes, dark feeding or nesting areas |
Ensure light reaches feeders, roosting bars, and nest boxes—these are the most active areas for eating and egg laying.
✅ Step 3: Automation – Timers & Gradual Light Increase
Manual switching is unreliable and disrupts hens’ hormonal rhythm. Automation is essential for stable egg production.
✔ What to Set Up:
Use automatic timers or IDS Smart Controller
Turn lights on before sunrise (e.g., 4:30 AM in winter)
Extend light in the evening after sunset to maintain 14–16 hours total light
⚠ Why gradual increase matters:
Jumping from 10 h to 16 h of light in one day stresses hens and can temporarily stop egg laying.
✔ Correct method: Increase light by 15–30 minutes per week.
✅ Example Winter Light Schedule
Week | Total Light Hours | Suggested Timer |
Week 1 | 12 h | Lights on 5:30 AM – 7:00 AM |
Week 2 | 12.5 h | Lights on 5:15 AM – 7:15 AM |
Week 3 | 13 h | Lights on 5:00 AM – 7:30 AM |
Week 4 | 14 h | Lights on 4:30 AM – 8:00 PM |
✅ Summary Checklist
✔ Choose the correct lighting (T5, T8, or T21 based on coop size and height)
✔ Install lights evenly with no dark zones
✔ Mount at the right height for full coverage
✔ Use timers and increase lighting duration gradually
Seasonal Chicken Coop Lights Guide (Winter, Summer, Spring/Fall)
Light needs change with the seasons. Even if you’ve set up the perfect system, failing to adjust it throughout the year can lead to stress, dropped egg production, or overstimulation. Use this seasonal guide to keep your flock laying consistently and comfortably.
1. Winter – Add Morning or Evening Light to Maintain 14–16 Hours
Winter days are short, often dropping to 8–10 hours of natural daylight. Without supplemental lighting, hens will naturally stop laying.
Lighting Strategy:
✔ Add artificial light in the early morning (e.g., start at 5:00–6:00 a.m.) or early evening.
✔ Keep total light exposure between 14–16 hours per day.
Why Morning Light Is Better:
Evening-only lighting can suddenly switch off, leaving hens in darkness before they perch—causing stress.
Morning light mimics sunrise naturally and helps chickens wake up gradually.
Key Winter Tips:
Use an automatic timer or IDS Controller to prevent human error.
Increase light duration slowly—no more than 30 minutes per week.
Ensure the coop remains dry and draft-free; light alone cannot compensate for poor housing.
2. Summer – Prevent Overexposure and Heat Stress
Summer naturally provides long daylight—sometimes more than 15–16 hours. Adding more light won’t increase egg production and can overstimulate hens.
Lighting Strategy:
✔ Do not exceed 16 hours of total light.
✔ Provide natural shading or blackout curtains if daylight is too long.
Key Summer Tips:
Over 16 hours of light can increase aggression, pecking, and stress.
Maintain proper ventilation—light increases activity, which means more heat.
Avoid very bright light; 5–10 lux is still enough even in summer.
3. Spring & Fall – Transition Seasons = Gentle Adjustments
Spring and fall are the best times to adjust lighting gradually and prepare hens for seasonal changes.
Lighting Strategy:
✔ Adjust light by +30 minutes per week until you reach 14–16 hours.
✔ Always make changes at the same time every week—consistency is key.
Key Spring/Fall Tips:
In early fall, start adding light before hens naturally stop laying.
In spring, maintain consistent lighting to avoid hormonal fluctuations.
Avoid sudden lighting reductions—it may cause molting or disrupt egg cycles.



