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Compact Fluorescent Lamp

M

mowhoong

Jan 1, 1970
0
When you turn the CFL on, It will take about 40 sec brighten fully ,
which make it very inconvenient to use.
Can any members help me to explain this phenomenon ? Thank You.

Regards
 
B

Bob Eld

Jan 1, 1970
0
mowhoong said:
When you turn the CFL on, It will take about 40 sec brighten fully ,
which make it very inconvenient to use.
Can any members help me to explain this phenomenon ? Thank You.

Regards


Most likely it's due to the time it takes for the mercury in the tube to
become fully vaporized. Mercury vapor in the tube emits UV light that excite
the visible light phosphors coated on the glass. The vapor has to come to a
certain level for the tube to operate at maximum output. When the tubes have
been off and cold, some of the vapor condenses to liquid mercury which takes
time to fully vaporize when warmed up.
 
M

Michael Black

Jan 1, 1970
0
When you turn the CFL on, It will take about 40 sec brighten fully ,
which make it very inconvenient to use.

Not when it's a light that you are going to keep on for a decent amount
of time. Which realistically where such bulbs best serve. A light
that is being turned on for only a few brief minutes, maybe even less,
won't be an environmental issue, so a CFL won't make a real difference.
But lights that stay on, like an office ceiling light or the light
over the front door, the slow turn on (and even slower when it's cold)
won't matter, but the lower current drain and longer life will be a
significant advantage there.

Michael
 
mowhoong said:
When you turn the CFL on, It will take about 40 sec brighten fully ,
which make it very inconvenient to use.
Can any members help me to explain this phenomenon ? Thank You.

Regards

Wow. I haven't had a crappy CFL like that in years. At the time it was
a Philips lamp. All the cheapos from Home Depot are at full brilliance
immediately - at least it's so subtle I don't notice it if they're
not. Those Philips lamps OTOH were very dim at first.

 
E

Eeyore

Jan 1, 1970
0
mowhoong said:
When you turn the CFL on, It will take about 40 sec brighten fully ,

Depends on brand and model. I know some that are as close to 'instant
on' at close to full brightness as you could reasonably expect. It does
get worse as they age though.

You're either talking about old technology ones or very cheap crap.

I buy Philips or Osram (Sylvania in the USA IIRC).

Graham
 
E

Eeyore

Jan 1, 1970
0
Wow. I haven't had a crappy CFL like that in years. At the time it was
a Philips lamp. All the cheapos from Home Depot are at full brilliance
immediately - at least it's so subtle I don't notice it if they're
not. Those Philips lamps OTOH were very dim at first.

Modern Philips ones in the UK are fine. 20 years or so ago I remember it
being a problem.

Graham
 
P

Phil Allison

Jan 1, 1970
0
When you turn the CFL on, It will take about 40 sec brighten
fully ,
which make it very inconvenient to use.
Can any members help me to explain this phenomenon ? Thank You.


Wow. I haven't had a crappy CFL like that in years. At the time it was
a Philips lamp. All the cheapos from Home Depot are at full brilliance
immediately - at least it's so subtle I don't notice it if they're
not. Those Philips lamps OTOH were very dim at first.


** Philips ( and many others) still sell very slow starting CFLs.

Their " Ambiance " range ( which look juts like normal peal bulbs) are all
very slow - ie, several minutes to reach full output on a cold morning.
The initial light level is about the same as one candle.

No use in a kitchen or bathroom - at all.



...... Phil
 
P

Phil Allison

Jan 1, 1970
0
"Eeysore"
Modern Philips ones in the UK are fine.


** Absolute BULLSHIT !!!!!!!!!!!!!

Buy a Philips "Ambience" CFL and see just how horribly slow they are.



...... Phil
 
P

Phil Allison

Jan 1, 1970
0
"Eeysore"
Depends on brand and model. I know some that are as close to 'instant
on' at close to full brightness as you could reasonably expect. It does
get worse as they age though.

You're either talking about old technology ones or very cheap crap.

I buy Philips or Osram (Sylvania in the USA IIRC).


** Philips "Tornado" spiral CFLs are also VERY SLOW to light up fully.

Even with a room temp of 20C they take about 3 minutes.



...... Phil
 
P

Phil Allison

Jan 1, 1970
0
<[email protected]
mowhoong said:
When you turn the CFL on, It will take about 40 sec brighten
fully , which make it very inconvenient to use.
Can any members help me to explain this phenomenon ?

All the cheapos from Home Depot are at full brilliance
immediately - at least it's so subtle I don't notice it if they're
not.


** The "cheapos" do light up fast.

Cos the tubes are just loaded with mercury and the heater filaments are
overdriven to hell.

They tend to go " booom " real quick too.




.... Phil
 
E

Eeyore

Jan 1, 1970
0
Phil said:
"Eeysore"

** Absolute BULLSHIT !!!!!!!!!!!!!

Buy a Philips "Ambience" CFL and see just how horribly slow they are.

That's not what they sell here.

I have had EXCELLENT results with Philips CFLs. In fact almost all of mine
are and have been Philips or Osram. I reckon I got 15,000 hrs out of one of
them.

Graham
 
E

Eeyore

Jan 1, 1970
0
Phil said:
"Eeysore"

** Philips "Tornado" spiral CFLs are also VERY SLOW to light up fully.

Even with a room temp of 20C they take about 3 minutes.

Haven't seen those ones. At least not that style by Philips.

What is interesting now is the different colour temp phosphors you can get up
to ~ 6400K. They're harsh for home lighting but good for technical work.

Graham
 
E

Eeyore

Jan 1, 1970
0
Phil said:
<[email protected]


All the cheapos from Home Depot are at full brilliance
immediately - at least it's so subtle I don't notice it if they're
not.

** The "cheapos" do light up fast.

Cos the tubes are just loaded with mercury and the heater filaments are
overdriven to hell.

They tend to go " booom " real quick too.

I bought 3 cheapos too. Similar results. Maybe they're more generous with
the mercury ? Not had one go bang though.

Graham
 
E

Eeyore

Jan 1, 1970
0
Phil said:
"Eeysore"

** Monstrous ego = zero honesty.

Snipping FUCKHOLE !

You whine about others doing it but you're the arch-expert.

Grahgm
 
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