LED E27 Bulb - Have Your Say

When we talk about replacement of conventional lighting, most people will replace the old bulbs and go for energy saving bulbs. Today in the market, we have 2 main types of energy saving bulbs today. The CFL and the LED bulbs. Which is the one to go for? A simple test is done in my office and various E27 socket light source are suspended at 1m height above the Lux measurement device. Only one bulb will be switch on at
 any one time.

First one up, the infamous incandescent bulb. The one that i have is the 40W clear glass bulb, it emits a warm light colour (probably around 2600K to 2800K range). The Lux reading is about 156 to 162. Next contestant, we have the energy saving CFL bulb.

The CFL bulb that i have is the 12W type and the colour that it cast is also warm light colour. I'm getting a good 131 Lux reading from this bulb. Slight depreciation in Lux level but the power wattage ratio of Incandescent to CFL in this case is about 1:4. Ok, next one in line is the new LED bulb.

This LED bulb is only using 5W, it emits a cool white colour to daylight colour. It's colour temperature is rated at 6000K. At 5W power consumption, it manage to produce 111 to 113 Lux level. Not very promising in terms of luminous level, but in terms of the power wattage ratio of Incandescent to LED. This case is about 1:8 respectively. From the measurement of the above 3 light bulbs, does it relates that the lower the power wattage, the less brighter the light source will be? Maybe... it is... but wait, let's see the 4th bulb measurement first.

This is the last bulb, it's the other LED bulb in this test. This one casts a daylight colour at 6500K and it's Lux reading is 200 to 203. It is quite impressive as this one is using only 8W power, this has effectively refute what has been seem right in this test (till the measurement of the 3rd light bulb). LED bulb is the way to go, in terms of energy saving and cost efficiency. What's your view on energy saving bulbs?

PS: Not all LED bulb are manufacture the same way, choose your light bulb carefully.