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Illumination Calculator

Science & Engineering

GB/T 50034 lux standards, lumen method, luminaire count

Quick Answer

Illumination Calculator: GB/T 50034 lux standards, lumen method, luminaire count. Illumination Calculator uses standard science & engineering formulas to compute accurate results instantly.

Room & luminaire

㎡
lm
Luminaires needed8 pcs

100 lx target · actual ≈ 112 lx

Calculation (lumen method)

  1. 1Total flux = 100 lx × 20 ㎡ = 2,000 lm
  2. 2Effective per luminaire = 700 × 0.5 × 0.8 = 280 lm
  3. 3Theoretical = 2,000 ÷ 280 = 7.14 → 8 pcs
  4. 4Actual illuminance = 8 × 280 ÷ 20 ≈ 112 lx
Per GB/T 50034-2024: living room 100lx, reading 300lx, bedroom 75lx, kitchen counter 150lx, office/classroom 300lx. Utilization factor depends on room geometry, surface reflectance and photometry (0.4-0.6 typical for homes); maintenance factor 0.8 clean / 0.6-0.7 dusty. This counts uniform ambient light only — task areas need extra desk/spot lighting to 300lx; elderly need 2-3x. Check lm, not watts (LED ≈ 80-120 lm/W).

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How to Use

  1. Enter known quantities: fill values and confirm units in the Illumination Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Illumination Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: GB/T 50034 lux standards, lumen method, luminaire count.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Illumination Calculator formula

Illumination Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Illumination Calculator?
Open the page and fill in the input fields — results update automatically. GB/T 50034 lux standards, lumen method, luminaire count.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Illumination Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/illumination

Results provided by this tool are for reference only and do not constitute professional advice.