Réponse rapide : 24° vs 36° — lequel est meilleur ?

• faisceau 24° → intensité plus élevée, éclairage focalisé, contraste plus fort
• faisceau 36° → couverture plus large, meilleure uniformité, moins de luminaires

• À 3m de hauteur, 36° couvre ~50–70% plus de surface que 24°

  Conclusion :
  Utiliser 24° pour l'éclairage d'accentuationet 36° pour l'éclairage général dans la plupart des projets commerciaux.

Points clés à retenir

• 24° = lux élevé + forte focalisation
• 36° = large couverture + meilleure uniformité
• 24° améliore la visibilité des produits
• 36° réduit la quantité de luminaires
• Mélanger les deux donne les meilleurs résultats

Pourquoi 24° et 36° sont les angles de faisceau les plus utilisés

Réalité sur site

Dans les environnements commerciaux (commerce de détail, hôtellerie) :

• les hauteurs de plafond varient généralement 2,5–4 m
• le temps d'installation est limité

• l'approvisionnement doit être standardisé

  24° et 36° sont les options les plus pratiques et les plus largement disponibles.

Explication technique

Selon les classifications de faisceau IES :

• 24° → faisceau spot (<30°)

• 36° → flood étroit (30–40°)

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

Ces angles offrent un équilibre optimal entre :

• intensité lumineuse
• zone de couverture
• flexibilité d'espacement

Perspective Directe d'Usine

Dans les grands projets d'hôtellerie :

• sur 60% des commandes sont 24° ou 36°
• en raison de la compatibilité avec les systèmes de rail et les commandes de gradation

24° vs 36° : Différences clés en un coup d'œil

Shadow Quality: A Key Visual Difference

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

• faisceau 24° → sharp, defined shadows
• faisceau 36° → soft, diffused shadows

Practical impact:

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

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

  Idée clé :

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)

Idée clé :

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.

Référence :
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:

• Utiliser 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.

Résultat :

• poor contrast
• weak product focus
• reduced visual impact

Our recommendation:

• Utiliser 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 faisceau 24°

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

Galerie

• 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

Perspective technique

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.