簡潔な回答：24° vs 36° — どちらが優れているか？

• 24°ビーム → より高い強度、集中照明、強いコントラスト
• 36°ビーム → より広い照射範囲、より均一な照度、少ない器具数

• 高さ3mでは、36°はカバー 約50～70％広い面積 24°よりも

  結論：
  使用 アクセント照明には24°, 、および 一般照明には36° ほとんどの商業プロジェクトで。.

要点まとめ

• 24° = 高照度 + 強い集中光
• 36° = 広いカバレッジ + より良い均一性
• 24°は製品の視認性を高める
• 36°は器具数を削減
• 両方を組み合わせることで最高の結果が得られます

24°と36°が最もよく使われるビーム角である理由

現場の現実

商業環境（小売、ホスピタリティ）では：

• 天井高は一般的に範囲 2.5～4m
• 設置時間は限られています

• 調達は標準化されなければならない

  24°と36°が最も実用的で広く利用可能な選択肢です。.

技術的説明

IESビーム分類によると：

• 24° → スポットビーム（<30°）

• 36° → ナロー・フラッド（30–40°）

  参照：
  https://www.ies.org/standards/

これらの角度は以下の間の最適なバランスを提供します：

• 光強度
• 照射範囲
• 間隔の柔軟性

メーカー直販の視点

大規模なホスピタリティプロジェクトでは：

• 以上 注文の60％ 24°または36°である
• トラックシステムおよび調光制御との互換性のため

24° vs 36°：一目でわかる主な違い

Shadow Quality: A Key Visual Difference

Beam angle affects not just brightness—but how objects look.

• 24°ビーム → sharp, defined shadows
• 36°ビーム → soft, diffused shadows

Practical impact:

• 24° → ideal for jewelry, watches, textured materials

• 36° → better for clothing, hospitality, ambient lighting

  Key insight:

Narrow beams create depth and contrast, while wider beams improve visual comfort.

Beam Diameter Formula (Design Tool)

Beam Width Calculation

Beam width = 2 × mounting height × tan(beam angle ÷ 2)

Example (3m ceiling)

• 24° → ~1.27m diameter

• 36° → ~1.95m diameter

  36° provides significantly larger coverage.

Reference (photometric testing):
https://www.ies.org/standards/lm-79/

Beam Spread Comparison (Coverage Difference)

Key insight:

Small changes in beam angle create large differences in lighting distribution.

Lux Comparison: Which One Is Brighter?

With identical lumen output:

• 24° → concentrated → higher lux
• 36° → spread → lower lux

Example (800lm @ 3m)

• 24° → ~1800 lux
• 36° → ~900 lux

CBCP (Center Beam Candle Power)

CBCP measures the peak intensity at the center of the beam.

• 24° typically delivers 30–50% higher CBCP

• creates stronger visual focus

  In retail lighting, higher CBCP makes products stand out more clearly.

参照：
https://cie.co.at/publications

Spacing Differences in Real Installations

Based on IES guidelines:
https://www.ies.org/handbook

Practical impact:

• 36° reduces fixture count by 30–40%
• lowers installation and wiring cost
• improves overall uniformity

Warning: Beam Angle vs Ceiling Height

If ceiling height exceeds 3.5m:

• 36° beams may not deliver sufficient lux
• lighting becomes flat and underpowered

Recommendation:

• 使用 24° or narrower beams
• especially for accent or vertical lighting

This is one of the most common mistakes in commercial projects.

Manufacturer Insight: Common Real-World Mistake

In many retail projects:

Clients choose 36° beams to reduce fixture quantity.

Result:

• poor contrast
• weak product focus
• reduced visual impact

Our recommendation:

• 使用 24° beams for key areas
• combine with 36° for ambient lighting

Glare Control Consideration

• 24° beams usually offer better glare control

• 36° beams may produce more spill light if optics are poor

  High-quality lens design is critical.

When to Use 24° Beam Angle

Use 24° when you need:

• accent lighting
• high contrast
• focused illumination

Applications:

• retail displays
• artwork lighting
• reception areas

Target: >1000 lux

When to Use 36° Beam Angle

Use 36° when you need:

• general lighting
• uniform distribution
• fewer fixtures

Applications:

• corridors
• hotel lobbies
• open commercial areas

Target: 500–800 lux

Application Note (Fixture Selection)

In higher ceilings (4–6m):

• larger fixtures like AR111
• combined with 24°ビーム

provide better intensity than standard GU10 lamps.

Real Project Examples

Retail

• 24° → product focus
• 36° → background

Hotel Lobby

• 36° grid for floor
• 24° for architectural features

Gallery

• 24° for artwork
• 36° for ambient

Combining both angles delivers optimal results.

Common Mistakes When Choosing Beam Angles

• Using 36° for high ceilings
• Using only one beam angle
• Ignoring spacing rules
• Not simulating lighting

Solution:

• use Dialux / Relux
• verify beam angle before installation

FAQ: 24° vs 36° Beam Angle

Which is better for 3m ceiling?

36° for general lighting.

Is 24° too narrow?

No — ideal for accent lighting.

Can I mix 24° and 36°?

Yes — standard professional approach.

Which saves more cost?

36° reduces fixture count but may reduce lighting quality.

Inventory Strategy for Distributors

For general commercial demand:

• 60% → 36° beam (general use)
• 40% → 24° beam (accent use)

This mix:

• reduces stock risk
• covers most applications
• improves turnover

Final Recommendation: How to Choose

• Need focus → choose 24°
• Need coverage → choose 36°
• Need both → combine both

Engineering Insight

In real projects:

• mixed beam strategy reduces cost by 20–30%
• improves lighting performance
• minimizes rework

Conclusion: Business Value

Choosing the right beam angle:

• reduces installation cost
• improves lighting quality
• avoids rework
• enhances long-term performance

24° = precision lighting tool
36° = efficiency lighting tool

Planning a commercial lighting project?

Our engineering team can help you:

• select beam angles
• optimize spacing
• simulate lighting

to avoid costly mistakes before installation.