Lighting System in terms of its efficiency and consumption

Question

I'm curious regarding some matters in my experiment session of Efficient Lighting System. There are 4 types of lamps which we measure the data to fill-in the table as in the picture. Correct me if my hypothesis is wrong.

1. The brighter the lamp, the higher the magnitude of luxes.
2. Does the higher the neutral current, the more it consumes energy?
3. CFL does consume more current as it produces brightest light which could be prove based on the lux value in the picture.
4. Electronic ballast is one type of lamp that can be categorised as energy efficiency because it uses less neutral current but produces higher brightness.

But what indicates the value of real power, reactive power, apparent power and power factor ? What are those powers relatable with this types of lamp? If you have any points to add, please do so.

Answer 1

The brighter the lamp, the higher the magnitude of luxes.

Depends on your definition of "brighter"...

1 lux = 1 lumen / m2

Say you want to light your desk. Same lamp at different distance from desk will produce different lux on your desk. Power decreases with square of distance, so double distance, divide the lux on your desk by 4. And if you put a mirror behind the lamp, or other kind of optics to direct the light, then you can direct more light where it is useful. So you get more lux, but the lamp is still the same.

Does the higher the neutral current, the more it consumes energy ?

That's only valid for resistors, and your lamp is not a resistor.

But what indicates the value of real power, reactive power, apparent power and power factor ?

"Apparent" power means you take the numbers on the ammeter, the numbers on the voltmeter, and you multiply them, so you get something that looks like a power, but it isn't meaningful except to check the rating of breakers and wires. Likewise for current alone.

Read the details.

Active (real) power is the one that counts, and it's what you pay for on the electricity bill. If you want to measure the efficiency of a lamp, or the how much light it puts out per watt of input power, then you have to use real power.

Answer 2

A true lux measurement is really hard, especially, while a few light objects is being compared by lux measurement points stability and light object placement much effect the result.

In short, if you want to compare light objects in terms of lux on the floor, you need to form a large grid on the surface and many measurement points on the grid you can not compare the light objects using just one lux measurement.

Light objects has different light patterns it means different light intensities at photometrical angles, if you have chance to measure a goniophotometrical measurement then you see light patterns, total flux, efficiency ( lumen/watt ) then you have information to be able to compare them.