What is Photometrics lighting?
Photometrics gauges how humans perceive light — its coverage area, i.e., where light cuts off and the intensity of light in relation to distance from the light source. In practical terms, photometrics shows whether a lighting plan meets the quantitative lighting requirements for a project.
How do you read a light distribution chart?
The light distribution curve values This is always measured starting from the centre point of the light source. The light intensity is expressed in Candela (cd) and is indicated on the circles in the graph. The larger the circle, the higher the candela value.
How do you read a photometric study?
How To Read A Photometric Plan
- Site Plan. Lighting fixtures: Look for shapes and symbols in a bright color.
- Calculation Zone Statistics. The most important part of a photometric study.
- Lighting Schedule.
- Luminaire Location Schedule.
- Photometric Plan Shaded View.
- Wireframe View with calculation points and contours.
How do you read a lumens chart?
Here’s a wattage equivalence chart, but note that lumen-per-watt ratios can range mildly, even from LED to LED products. The number of lumens a bulb produces for each watt it consumes. The higher the number, the more efficient the bulb….Key Terms.
| Room | Foot Candles Needed |
|---|---|
| Libraries | 50-100 |
| Schools | 30-100 |
How do you read a candlepower distribution curve?
The straight lines radiating from the center point identify the angle of the light emitted while the circles represent the intensity. For instance, point A above shows that the intensity of light at 80° is approximately 110 candlepower. Point B shows that at 30° you will get about 225 candlepower.
How do you read a photometric site plan?
What is a Photometrics plan?
Photometric plan means a diagram drawn to scale depicting the location of all light poles and building mounted light fixtures in a specific area and a numerical grid of the maintained lighting levels that the fixtures will produce.
At what distance are lumens measured?
If we cut a hole that measures 0.09 square meters (1 square foot) in the centre of this sphere, the light that shines through is what we define as a lumen. A foot-candle equals one lumen per square foot.