Philips CFL that I bought in 2013, about 5% burned in 6 months (some as early as 1 month), 15% burned in 12 months, some just burned without noticing because seldom used. I bought it from authorized philips shop that you all mentioned but without warranty. Should I give Philips LED a try or to consider GE, OSRAM or any other brand?

Price paid for a lesson. I had heard too some people recommended panasonic..
It just kind of weird, those called leaders of the "light" industries couldn't produce quality CFL, like philips and osram. GE bulbs still working after replacing some of the philips..

General guide that i used

Location Illuminance (lux) 
Living room 50
Bedroom 50
Reading room 150
Hall/landing 150
Study 300
Kitchen 300
Outdoor entrances 30
Corridors 100
Restaurant 100
Entrance hall 150
Stairs 150
Public house bar 150
Casual assembly work 200
Rough/heavy work 300
Filing room 300
Classroom 300
Medium assembly work 500
General office work 500
Shop counter 500
Supermarket 500
Laboratory 500
Kitchen 500
Computer room 750
Drawing office 750
Fine assembly work 1000
Precision work 1500

Can't remember the source d.

This post has been edited by codeiki: Nov 19 2015, 07:48 PM

1 lux = 1 lm/m2
i read in my bedroom, so my bedroom brightness is about the same as study room when turning on all the lights
total lm = 300 lux (study room) * bedroom size in m2 (22.84)
total lm = 6851
if you planning to get an even light in every corner probably 6 bulbs and each about 1141lm..
It's a rough guide i used to follow

This post has been edited by codeiki: Nov 19 2015, 07:50 PM

You can select a range of brightness that you needed. Let say bedroom, most other time is about 50 lux
total lm = 50 lux (bedroom)* bedroom size in m2 (22.84)
total lm = 1142

So the bedroom brightness is range from 1142- 6851lm
Then you can put switch to turn on number of bulbs you need. 1 switch for 2 bulbs, you will get about 100 lux (1 switch on), 200lux (2 switch on) and 300 lux (3 switch on)

I tried this in my dining hall.
1. I changed all 4 E27 sockets to LED bulb at the same time (all bulb has same luminance, will undergo same amount of switching on-off and usage time)
2. The 4 LED bulb that I used is - 1 midea, 1 philips, 1 osram, 1 mrDIY with the price range from 11+ to 28+
3. The color is not much differencecomparaing each other, if you are didn't pay very much attention to it.
4. After 6 months usage, all except one is stop functioning. The brand started with o.... (this i get a replacement as it still under warranty)
5. The rest of the LED bulbs still has the same amount of luminance/color comparing each others.
6. The test is still ongoing.

The test is limited by one random LED bulb which may not be representative of the whole product. I can only conclude that the cheaper brand is not worse than the more branded one.

This post has been edited by codeiki: Jun 26 2016, 03:54 PM