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Energy Saving Lamps...Demystification...
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Gordon Gekko
#11 Posted : Tuesday, September 10, 2013 3:52:21 PM
Rank: Elder

Joined: 5/27/2008
Posts: 3,760
Lumen, X-men, hymen...is there an English speaker in the house?Sad
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butterflyke
#12 Posted : Tuesday, September 10, 2013 5:04:08 PM
Rank: Elder

Joined: 5/1/2010
Posts: 3,024
Location: Hapa
Gordon Gekko wrote:
Lumen, X-men, hymen...is there an English speaker in the house?Sad



smile
Float like a butterfly, sting like a bee. - Muhammad Ali🐝
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Impunity
#13 Posted : Tuesday, September 10, 2013 6:21:24 PM
Rank: Elder

Joined: 3/2/2009
Posts: 26,331
Location: Masada
Gordon Gekko wrote:
Lumen, X-men, hymen...is there an English speaker in the house?Sad


Laughing out loudly Laughing out loudly Laughing out loudly
Portfolio: Sold
You know you've made it when you get a parking space for your yatcht.
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Impunity
#14 Posted : Tuesday, September 10, 2013 6:25:06 PM
Rank: Elder

Joined: 3/2/2009
Posts: 26,331
Location: Masada
mukiha wrote:
Impunity wrote:
mukiha wrote:
Impunity wrote:
Baratang wrote:
Gordon Gekko wrote:
Now in English please.....

jeez you cannot read the figures or what?

On light note could @ Kaigangio explain what is this animal called "lumen". It might help us to understand the basics.


Lumen = a measure of the total "amount" of visible light emitted by a source, its measured in units called "candela".
smile


Say that again....

What do you mean? That lumens are measured in candelas? That doesn't make any sense!


The candela is the SI base unit of luminous intensity.


And how does is it relate to lumen?

I can see lumen in luminosity... and candela in candle; but how they connect?


The connection is available inside engineering lecture theaters!
Portfolio: Sold
You know you've made it when you get a parking space for your yatcht.
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Kaigangio
#15 Posted : Tuesday, September 10, 2013 9:50:56 PM
Rank: Elder

Joined: 2/27/2007
Posts: 2,768
Hi guys

Seems there might be a problem getting the real definitions and meanings of the photometric quantities and parameters on the subject of light...

Let us start from here:

The study of light, its generation, propagation/transmission, manipulation, utilisation, properties and behaviour is known as Optics. This is one of the science subject studied in great detail in physics.

Photometry is the actual measurement of visible light in terms of its perceived nature/ brightness to human eye and vision....

The commonest photometric quantities relevant to the various photometric computations and designs are:

Photometric quantity.............SI Unit............Unit Symbol

1. Luminous Energy......Lumen Second.......lm-s

2. luminous Flux.......Lumen (cd-sr)......lm

3. Luminous Intensity...Candela (lm/sr)....cd

4. Luminance...........Candela/m2........cd/m2

5. Illuminance.........Lux (lm/m2)........lx

6. Luminous Emittance..Lux (lm/m2)........lx

7. Luminous Exposure...Lux-Second........lx-s

8. Luminous Energy density...Lumen Sec/m3...lm-s/m3

9. Luminous Efficacy...Lumen/Watt........lm/W

I bet upto here it is so far so good...smile smile
...besides, the presence of a safe alone does not signify that there is money inside...
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GGK
#16 Posted : Tuesday, September 10, 2013 11:16:01 PM
Rank: Member

Joined: 11/21/2006
Posts: 608
Location: Ruiru
good analysis.
GoK needs to facilitate Kenyans switch to CFL
"..I am because we are. "― Ubuntu, Umtu,
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Angelica _ann
#17 Posted : Wednesday, September 11, 2013 6:56:12 AM
Rank: Elder

Joined: 12/7/2012
Posts: 11,935
Great Bw. Landlord. But this had not been invented during out time of Eng.,Lit.,His & GP.

Next mbuzi you are the guest speaker.
In the business world, everyone is paid in two coins - cash and experience. Take the experience first; the cash will come later - H Geneen
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Gordon Gekko
#18 Posted : Wednesday, September 11, 2013 12:46:44 PM
Rank: Elder

Joined: 5/27/2008
Posts: 3,760
Angelica _ann wrote:
Great Bw. Landlord. But this had not been invented during out time of Eng.,Lit.,His & GP.

Next mbuzi you are the guest speaker.


True true. If it had been invented, then the landlord did Man Power Combination....
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Baratang
#19 Posted : Wednesday, September 11, 2013 8:00:57 PM
Rank: Member

Joined: 10/6/2009
Posts: 587
Kaigangio wrote:
Hi guys

Seems there might be a problem getting the real definitions and meanings of the photometric quantities and parameters on the subject of light...

Let us start from here:

The study of light, its generation, propagation/transmission, manipulation, utilisation, properties and behaviour is known as Optics. This is one of the science subject studied in great detail in physics.

Photometry is the actual measurement of visible light in terms of its perceived nature/ brightness to human eye and vision....

The commonest photometric quantities relevant to the various photometric computations and designs are:

Photometric quantity.............SI Unit............Unit Symbol

1. Luminous Energy......Lumen Second.......lm-s

2. luminous Flux.......Lumen (cd-sr)......lm

3. Luminous Intensity...Candela (lm/sr)....cd

4. Luminance...........Candela/m2........cd/m2

5. Illuminance.........Lux (lm/m2)........lx

6. Luminous Emittance..Lux (lm/m2)........lx

7. Luminous Exposure...Lux-Second........lx-s

8. Luminous Energy density...Lumen Sec/m3...lm-s/m3

9. Luminous Efficacy...Lumen/Watt........lm/W

I bet upto here it is so far so good...smile smile


So far so good, but would you kindly explain to us the actual meaning of those photometric quantities. It may help us in appreciating the information given in the lamps packaging.
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Njung'e
#20 Posted : Thursday, September 12, 2013 12:09:50 AM
Rank: Elder

Joined: 2/7/2007
Posts: 11,935
Location: Nairobi
Gordon Gekko wrote:
Angelica _ann wrote:
Great Bw. Landlord. But this had not been invented during out time of Eng.,Lit.,His & GP.

Next mbuzi you are the guest speaker.


True true. If it had been invented, then the landlord did Man Power Combination....


MPC stuff no doubt!Great to see there are people who can still crunch numbers without consulting google.

@Mukiha,
should i not laugh?smile
Nothing great was ever achieved without enthusiasm.
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  | | Edit by user: Thursday, September 12, 2013 12:10 AM | Reason: Not specified
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