I ran across this video where Mehdi from ElectroBOOM was evaluating light bulbs of different types.

In performing his comparison he touched upon a something I find very important. A methodology to compare a bunch of options. I have found that without a way to do this it can be easy to get paralyzed by all the many choices you have.

IMG_20220313_090622_HDR.jpg

This is a simplification of the table he was drawing up while comparing the light bulbs.

good or bad property to evaluate incandenscent halogen cfl led
b1 (more is worse) power usage (watts) 60 43 13 8.8
g1 (more is better) output level (lumens) 700 750 850 800
g2 (more is better) light quality 1 1 0.5 0.9
b2 (more is worse) life of bulb 2kh 1kh 10kh 15kh

In the subsequent columns the top row was the things he was comparing

The good or bad column

  • In the case of power usage, we want the light to use LESS power, so if the power consumption of the bulb is more, we think that is a BAD thing. so we label it with a prefix b

  • in the case of the output level, we want it to give off MORE light so incadescent putting off 700 lumens is something we want, more is better, so we prefix it with a g

The Magic of Math or Deriving a useful value from the whole thing

In this screenshot he is showing you an equation which adds up to a the Consumer Experience Factor

Algorithm for decision.jpg

How to do it in a nutshell:

  1. make a list of options you want to compare
  2. make a list of all the properties for each option
  3. classify each property as “desirable” or “undesirable”
  4. measure each of the properties for all the options
  5. for each option:
    1. multiply the “desirables” together
    2. multiply the “undesirables” together
    3. divide the positive value by the negative value
    4. this will yield the Consumer Experience Factor he mentions
  6. Compare the numbers for each option. The higher the number the better.

The magic is that by multiplying the values in step 5, you dont have worry about the fact that one property might be in miles-per-hour or lumens or color