(20S) and (21S) Intensity and Illumination
05-20-2019, 12:48 PM (This post was last modified: 05-20-2019 12:50 PM by Eddie W. Shore.)
Post: #1 Eddie W. Shore Senior Member Posts: 1,121 Joined: Dec 2013
(20S) and (21S) Intensity and Illumination
The follow equation relates the luminous intensity (measured in candelas, cd) and illuminance (measured in lux) of a light source. The equation assumes the light source radiates a spherical matter.

E = I / R^2

E = illuminance
I = luminous intensity
R = radius of the sphere's light (meters)

LBL A: Solve for E
LBL B: Solve for I
LBL C: Solve for R

Registers:
R0 = E
R1 = I
R2 = R

Store the following values in the register and execute the appropriate label.

Program:
Code:
 01  LBL A:  61,41,A 02 RCL 1:  22, 1 03 ÷:  45 04 RCL 2:  22, 2 05 x^2:  51, 11 06 =: 74 07 STO 0:  21, 0 08 R/S:  26 09 LBL B:  61,41,B 10  RCL 0: 22,0 11  *:  55 12  RCL 2: 22,2 13  x^2:  51,11 14  =:  74 15  STO 1: 21, 1 16  R/S:  26 17  LBL C: 61,41,C 18  RCL 1: 22,1 19 ÷: 45 20 RCL 0: 22,0 21  =:  74 22 √:  11 23 STO 2: 21, 2 24 R/S:  26

Example 1:
R1 = I = 400, R2 = R = 2.
Solve for E, XEQ A returns 100

Example 2:
R0 = E = 180, R2 = R = 3
Solve for I, XEQ B returns 1620

Example 3:
R1 = I =420, R0 = E = 195
Solve for R, XEQ C returns 1.467598771
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