LED measurement: Why we measure

Interview with Mr. Christian Hoffmann, President of LUMITRONIX« LED-Technik GmbH

„An investment in quality and truth is a good investment“

Question: Mr. Hoffmann, such a measuring system, as you have purchased, is generally used in Development Departments or in production at large corporations for quality control. Are you trying to compete with LED manufacturers?
Hoffmann: No, we are and will remain a distributor. But a distributor with high standards. We want to offer our customers services which will help them to actually achieve what they’re trying to achieve with LED-illuminants.

Question: Are your customers failing their duties?
Hoffmann: No, the problem is not the user’s inability. The problem is they are being supplied with insufficient or incorrect information.

Question: Information about the LED’s – their brightness for example?
Hoffmann: Yes, unfortunately it’s like this: with many products, the technical specifications are inadequate or are partly or completely incorrect. Misinformation is oftentimes not only negligently, but even wilfully used to obtain customers.

Question: So then your data is correct?
Hoffmann: We measure according to internationally accepted standards.

Question: Why is it so important for this data to be this precise?
Hoffmann: If e.g. a booth at a tradeshow, a workplace or a display is being illuminated, the values listed must be accurately achieved. Or if a cell phone display goes into power save mode, it needs to dim evenly, you can’t have the background flickering green or yellow.

Question: So you can test whether the LED lives up to its promises?
Hoffmann: Yes, or if it’s suitable for the intended application. We provide the customer with the relevant data and he can then decide whether the values will suffice for his project. Or he can compare it to other light sources, and perform true power evaluations. We can even select exact standard values upon request (e.g. ranging at +/- 1nm or ranging at less than mcd, Volt, lumen etc.).

Question: Good and bad LED’s?
Hoffmann: Let’s just say: suitable. Depending on manufacturing, you can find LED’s of different brightness levels within the same lot. If they are installed close to each other, you will notice. We can combine those with the exact same light luminance and / or colour.

Question: Are you using the measuring system on your own assortment?
Hoffmann: Sure. Here and there, we have also offered products with corrected data in the past, if the LED seemed overrated to us. Even if it was to our disadvantage.

Question: Disadvantage in what sense?
Hoffmann: If we notice an LED actually has a lower output than listed in the spec sheet, we have offered it with a lower value. This can then lead to seemingly buying more light from the competition, which hasn’t made the correction, for the same amount of money.

Question: But you want to mainly use the new measuring system upon customer request and make money?
Hoffmann: We have spent a lot of money. You have to figure about a 60,000€ investment. We do see a market here, because we can especially help industrial users with their problems. But even an investment in quality and truth of data is a good investment.
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Created at
July 23, 2017 11:59:14 PM UTC