The counter will be reset asap for the new experiment #2.
| The history of experiment #1 and the new experiment #2 |
1. The lamps of experiment #1
Experiment #1 used only top grade lamps from Osram::
OSRAM 100 W incandescent lamp: white-soft" type 100W lamp, with a luminous flow of 1200 lumen, made by Osram France, part specification is "Bellalux Soft White, Bella T55 SIL 100, 230V E27/ES. The energy rating is F (best would be A, worst G). A scan in pdf format of the box can be found here.. Cost about 1.50 EUR
OSRAM 20W dimmable DULUX EL, made in Germany;
luminous
flow of 1230 lumen and a specified lifetime of 15000 hours (!). It is dimmable,
with the restriction that at most 4 lamps can be driven by one 500W rated
dimmer. Energy rating is A. Part specification is: Osram Dulux EL dimmable,
20W/827, Lumilux Warm White, 1230 lm, 220-240 VAC, E27, 50/60 Hz. Look here
for a scan in pdf format of the packaging..
Extremely expensive: cost about 30 .- EUR
The experiment #1 started definitively the 12 Jan. 2009 at approx. 16:45 local time (15:45 UTC).
The timing of the on/off sequence is practically 58 s (switching frequency is 1/116 = 8.6 mHz ) : the lamps are in the on state for 58s, than switched off for 58s, etc...
The incandescent lamp blew during the 1st March 2009, 48 days after the start of the experiment. It survived 35048 on/off switchings and approx. 564 hours in the incandescent state. The Rolls-Royce CFL shows some blackening at the base, but still runs fine. It was switched off at counter state 36290 (i.e. after approx. 585 hours in the luminant state).
| Counters at the end of experiment 1 | |
| Survivor with some scars (notice black at base of tube) | |
| A total of 23
votes were given: the 13 voters for the CFL blowing first were wrong! The counter will be reset asap for the new experiment #2. |
|
Conclusion:
The very expensive Osram DULUX EL wins the contest.
Here are the approximate running costs up to the point where the incandescent lamp blew (the price of 1 KWh is taken as 0.125 EUR)
| OSRAM 100W incandescent | 0.1*564*0.125 = 7.05 EUR | Total cost up to this point = 7.05 + 1.50 = 8.55.- |
| OSRAM 20 W DULUX EL | 0.02* 564*0.125 = 1.41 EUR | Total cost up to this point = 1.41 + 30 = 31.41.- |
Breakeven point assuming "eternal life" for the CFL and a new incandescent bulb after 564 hours of continuous operation:
8.55*x = 30 + 1.41*x where x = multiple of 48 days
x = 4.20 which corresponds to 202 days (or 4848 hours of continuous operation)
2. Experiment # 2
This will be the poor man's experiment: a low cost 100W E-Lektro incandescent bulb purchased at a hardware shop (about 1.- EUR) and a cheap 20W IKEA CFL (about 8.- EUR).
Click for the
scans of the packaging of the E-Lektro
and the IKEA cfl.
The E-Lektro bulb is manufactured in Western Europe (country unknown) and sold by Zeus GmbH, a company specializing in selling goods to hardware shops. Luminous flow is 1300 lm, color of glass satin, mat. The energy rating is E. It should be noted that the luminous flow is 100 lm higher than that of the Osram Bellalux used in experiment #1., which had a rating of only F.
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| The 20W Ikea
CFL has a luminous flow of 1200 lm and has an energy rating of A. It is manufactured in the U.A.E. = United Arab Emirates |
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Experiment #2 started the 2th March 2009 at approx. 16:00 local time.