What I hear, I forget; What I hear and see, I remember a little; What I hear, see, and questions about or discuss with someone else, I begin to understand; What I hear, see, discuss, and do, I acquire knowledge and skills, What I teach to another, I master (Munthe, 2009: 63)
The light source emits energy in the form of a wave which is part of the electromagnetic wave. Figure 2:38 shows the source of natural light from the sun is composed of light is not visible and visible 2504 bulb light.
At 2:39 the picture can be seen that the rays of light that leaves the prism deflected from red to purple. 2504 bulb Color is determined by the wavelength of light. 2504 bulb V velocity of electromagnetic waves in free space = 3.105 km / sec. If frequency energy and wavelength = f (lambda), then applies:
In addition to having 2504 bulb a certain color, each wavelength that gives a certain intensity similarities, from 2:41 image shows that the human eye is most sensitive 2504 bulb to light with lambda = 555mU yellow - green.
If the position of our eyes like the picture above, we feel that we can feel the view is dazzling because our eyes get: Direct light from electric lamps and indirect light / reflected light of the image that we see.
With these conditions we can not see the target object image with ease. Outlook bright glare can be defined as excessive in our eyes because of the direct light or reflected light, or both. Eyes so we can see the target object 2504 bulb with a comfortable 2504 bulb / clear, then arranged in such a way that light falls on the target object and not on our eyes. To understand the movement has dazzled sight vision, 2504 bulb we need to learn a little about the workings of the human eye (picture below).
Iris works as a curtain / cover to control the amount of light entering the eye. As we see, that light is a form of radiant energy 2504 bulb that passes through the lens to the sensitive nerve layer called the retina 2504 bulb at the back of the eye. Then conveyed by the optic nerve to the brain which causes the feeling of light. Look directly at a light source, produced a strong impression on the retina. To prevent damage to the sensitive part of the eye, automatically rainbow contract. This condition reduces the intensity of the received shadows. By closing the iris will reduce the amount of light received. 2504 bulb So the strong bright light in the wrong position, will actually make the uncomfortable sight, and will also cause eye fatigue effect. To prevent glare view installation 2504 bulb techniques 2504 bulb required light source or armature correctly.
Radian is the angle at the midpoint of the circle between two radii where the two ends of the arc distance is equal to the radius (eg R = 1m). therefore circumference of a circle = 2.22/7.R, then:
Because the surface area of the sphere = 4.22/7.RR, then around 2504 bulb the midpoint of the ball there is a 4:22 / 7 corner rooms each = 1 steradian. The amount of space an angle steradian expressed by the symbol omega.
Is the amount of light emitted by the light source. Coat of light flux is F or Ø and units in the lumen (lm). One lumen is the luminous flux emitted within 1 steradian of a light source of 1 cd on the ball surface of radius R = 1m.
Is a good measure of the brightness of an object 2504 bulb on the light source and the surface. Illumination that is too large will dazzle the eye (eg incandescent lamps without the amateur). Turning on a light source and a light-reflecting surface is the intensity divided by area of all the surfaces. While the surface area of all light sources are widely projected on a flat plane perpendicular to the direction 2504 bulb of view, so it is not entirely level. 2504 bulb
Illumination is often also called enlightenment or illumination intensity or the BSN called Level Lighting on a plane is the flux of light that illuminates the surface of a field. Coat illumination is E with unit lux (lx).
Is the ratio ranges between luminous flux (lumens) to power a light source (watts), in units of lumens / watt. Efficacy was also called specific light flux. The following table shows the efficacy 2504 bulb of various lights. The efficacy data is usually obtained at a catalog of lighting products. 2504 bulb
9. Lighting laws crucial units are used in lighting techniques include: angle steradian space W (Sr) Light intensity I Candela (cd) light flux F (Ø) lumen (Lm) luminescence 2504 bulb L (cd/m2) Illumination E Lux (lx )
Light from 1 cd source that illuminates 2504 bulb the field of x (1 m2) within 1 m will illuminate 1 lux. If the distance is then multiplied by two (to field
