Renewable Energy

Spectrum of moon light

Posted by Marcel van der Steen in Explanation No Comments »

005_moonWhen I was looking for a spectrum of moonlight, I could not find it on the internet. As I do a lot of lamp measurements myself (see the category lamp measurements), I decided to measure the moon spectrum myself and put that info available on the internet.
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Endurance LED bulb and relation to warmup measurement

Posted by Marcel van der Steen in Explanation No Comments »

hourglass-couplesAt OliNo we do a warm-up measurement on the lamps we test. During this warm-up until stabilization, a lot of the LED lamps show a decrease in consumed power and as well in light output. When the drop in light output is significantly bigger than the drop in consumed, this could be an indication of a not too long lifetime.

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Abalight – STEP panel 14501 driver LCI-35W-700mA-TEC-SR

Posted by Marcel van der Steen in Uncategorized 1 Comment »

Abalight presents an LED panel. The measurements from OliNo show that the lamp emits a warm/neutral white light with a color temperature of 3808 K. The lamp consumes 26.5 W and has a luminous flux of 3180 lm. This results in an efficacy of 120 lm/W. The lamps energy category label is A++.

This article shows the measurement results. Many parameters are also found in the Eulumdat file.

See this overview for a comparison with other light bulbs.

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Generation kWh by citizens

Posted by Gijsbert Huijink in Self Sustaining 2 Comments »

 SOM ENERGIA SpainIt all started with 157 people, founders of Som Energia, in December 2010 with the aim to jointly produce and consume their own renewable energy. In January 2011 work started to obtain all necessary permits for selling electricity started and by October  the service was launched, initially for just a few hundred clients.

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Color Quality Scale (CQS): Measuring the color quality of light sources

Posted by Marcel van der Steen in Explanation 7 Comments »

CIELabThe Color Rendering Index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source. The CRI is originally designed to evaluate fluorescent lamps. The CRI was intended to measure the ‘naturalness’ of objects’ colors, not preference. It has been found that the CRI is not reliable when used for LED lamps.

A successor, the Color Quality Scale (CQS), has implemented a number of improvements making it an alternative to the CRI and a better method for determining the color quality.
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Difference Qlumedit and LDTeditor

Posted by Marcel van der Steen in Explanation No Comments »

QlumeditVsLDTeditorWith every lamp measurement comes an eulumdat file. This is a photometric file enabling you to simulate light distribution and light patterns in a certain area like an office, or on streets etc.

It appears that two programs, Qlumedit, and LDTeditor, do read in differently an equal eulumdat file when symmetry is present along the C90 C270 axis.

Personally, I do not understand the way LDT editor does it.

Update 3 March 2015: One more catch with DIalux and IES file. Dialux does not well understand dimensions used in IES files.

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LumitexT – Endurance test 4x strip LumiBOX-XT(NV) 350mm 3-LED

Posted by Marcel van der Steen in Endurance Test No Comments »

LumitexT has put 4 LED-strips in endurance test.

This article presents the endurance test results. The test has run more than 6,000 hours. Then the test went on until 8,400 hours. The graphs have been updated.

See also the results of the 0-hours test.

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Lampreparatur im Studentenwohnheim

Posted by Marcel van der Steen in Energy saving, Explanation, Lamps No Comments »

20140811_075402_artikelDieser Artikel zeigt warum eine Leuchtstoffröhre nicht mehr funktionierte und die Erfahrung deren Reparatur. Diese Aktion hat die Folge, dass man jetzt die alte Leuchte niet wegsmeißen muss sondern weiter verwenden kann, aber auf Grund des Alters der Leuchte war es nicht so einfach sie sicher zu reparieren.

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Solarzellenpaneele oder Sonnenkollektoren?

Posted by Marcel van der Steen in Energy saving, Explanation, Solar energy No Comments »

20140626_131259_artikelIn diesem Artikel erkläre ich wie ich eine Wahl getroffen habe zwischen Solarzellenpaneele (oder kürzer Solarpaneele, bringen elektrische Energie) und Sonnenkollektoren (bringen Wärme-energie).  Ich habe schön eine Wärmepumpe (Nutzung der Erdwärme mittels Wasser) und vielen raten mir an Sonnenkollektoren zu verwenden, damit die warmes Wasser machen wenn es viel Sonne gibt. Das Pufferfass wird so extra aufgewärmt durch warmes Wasser von den Kollektoren damit die Wärmepumpe keine (elektrische) Energie anwenden muss für Heizung. Dazu kommt noch dass für die Heizung warmes Wasser eine Wärmepumpe ein niedrigeres Leistungszahl hat weil die Temperatur des Wassers hoch sein muss (45 – 50 Grad).

Dieser Artikel macht einen Energie- und Kostenvergleich zwischen beide Forme von Energieerzeugung.

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How to pay easily with bitcoins

Posted by Marcel van der Steen in Explanation No Comments »

Since March 2014 OliNo accepts payments with bitcoin. Internationally it is very cheap to pay with bitcoins as the transfer fee (also called a miner fee) is about 8 eurocents. And the payment is immediate (firm confirmation after 1 hour) and irreversible; there is no bank in between! That is also a main reason why we support it: no bank is needed, and you can manage your own money. Also the politics have less influence and they cannot print additional bitcoins.

We as OliNo support a future where we as people can deal ourselves with our money we use and are not dependent from banks or politics. We give a 10 % discount if you pay with bitcoins. In this article we explain how payment can be done easily.

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