Comparison of different lamps

(Deutsche Version) Today I want to compare three lamps which could be suitable as room light. The candidates are:
a) An "old" halogen bulb
b) A helical energy-effective lamp (Link)
c) A COB-LED (Link)

At first the specifications:
a) Power: 40 W
luminous flux: 390 Lum
life time: 2 000 h
price: 2 €

b) Power: 23 W
luminous flux: 1 550 Lum
life time: 10 000 h
price: 8 €

c) Power: 7 W
luminous flux: 560 Lum
life time: >10 000 h (no value on Pollin.de, approximately 25 000 h)
price: 6 € (with heat sink, the LED only costs 3 €)

The first point of comparison is: How much light comes out of how much power? I show the values in Lum/W:
a) 10
b) 67
c) 80
The LED and the energy-effective lamp are clearly winning at this point.

The next point: how much light comes out of how much money? Here are the values in Lum/€:
a) 195
b) 194
c) 95
The LED looses this competition because LEDs are more expensive.

As the most important point of comparison I want to light a room for 5 years. I assume 5000 Lum and 6 hours of light per day, this are about 2000 hours. How many lamps would I need to reach the 5000 Lum?
a) 13
b) 3
c) 9
If you consider the life time, all halogen bulbs have to be switched every year, whilst the energy-effective lamp and the LED survive the whole 5 Jears. This increases the costs for the halogen bulbs by a factor of 5. The prices for the lamps are:
a) 128
b) 26
c) 53
consider: The costs for the LED are 50% for the heat sink. Now i want to examine the power consumption:
a) 1026 kWh
b) 148 kWh
c) 125 kWh
If I assume 20 ct / kWh, the costs for 5 jears are:
a) 205
b) 30
c) 25

The cheapest one is the energy-effective lamp. For the LED: Please note that the costs are basically only 50% because of the heat sinks. Additionally, an LED lasts much longer than an energy-efficient lamp, in the long term, the LED wins this competition because it also has a slightly smaller power consumption.