May 20, 2025

Xls : LUX - Lumen Calculator

 

A lux-lumen calculator for home is a tool used to determine the appropriate lighting levels for different rooms or areas in a house. It helps homeowners and designers ensure that each space is lit adequately for its intended use, balancing comfort, energy efficiency, and aesthetics.

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🔍 Key Terms:

  • Lumen (lm): A measure of the total amount of visible light emitted by a source (e.g., a light bulb).
  • Lux (lx): A measure of illuminance, or how much light (lumens) is spread over a given area (1 lux = 1 lumen/m²).

 

🏠 Why It's Important for Homes:

  1. Proper Lighting Design:
    • Ensures each room has the right brightness level (e.g., brighter in kitchens, softer in bedrooms).
    • Prevents under- or over-lighting, which can cause eye strain or waste energy.
  2. Energy Efficiency:
    • Helps choose the right number and type of bulbs to avoid excessive power consumption.
  3. Cost Savings:
    • Optimizing lighting reduces electricity bills and extends bulb life.
  4. Comfort and Mood:
    • Lighting affects mood and productivity. For example, warm lighting is relaxing, while cool lighting is energizing.
  5. Safety:
    • Ensures areas like staircases, hallways, and entrances are well-lit to prevent accidents.

 

🧮 How It Works:

A lux-lumen calculator typically asks for:

  • Room dimensions (length × width × height)
  • Desired lux level (based on room type)
  • Lumen output of your light source

It then calculates:

  • How many lumens are needed
  • How many light fixtures or bulbs are required.



Oct 20, 2024

Lisp : Select by Handle ID

What is the HandleID of an Object?

  • The HandleID is a unique, persistent identifier assigned to an object within each drawing in Civil3D.

How to find the HandleID

    Command : :LIST 
    Select Object






How to select an entity using its HandleID
  • At the command line, type _SELECT
  • When prompted to select objects, enter (HANDENT "HandleID")
  • replacing HandleID with the entity’s handle identification value.
  •  The entity will then be selected and highlighted.

Select an object by its HandleID using the ‘Select by ID’ Lisp.

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    Command : SID
    Enter Handle ID : xxx