Fittings catalogue 2021

10.5 www.demos ‑trade.com CRI (COLOR RENDERING INDEX) CRI Ra ~ 50 CRI Ra ~ 70 CRI Ra ~ 90 F U R N I T U R E L I G H T S tips and tricks – LED strips and transformers Ĺ Observe necessary work rules for sensitive electronics, for detailed information see p. 10.5. LED strips LED technology has been on the rise for several years due to its long life service and, above all, very low energy consumption. LED strips are especially popular because of the possibil- ity of lighting the space along the whole length, there is no uneven lighting caused by bulb sources. You will find a wide range of LED strips in our offer. Available by the metre, you can specify the length yourself or we will prepare a custommade set for you after completing the form. LED strips are available in 12 V and 24 V versions, with IP20 or IP65. The strips shine either in one colour in warm, neutral or cold white, or you can also purchase CCT / RGB / RGBW with the option to change colour according to your need and mood. Transformers It is not possible to combine 12 V LED strips with the 24 V transformer and vice versa. The transformer must always have sufficient reserve for the respective LED strip set. During normal use, the reserve should be 20%, if used for more than 5 hours, we recommend increasing the reserve to 30% or more. Offered transformers have protection to prevent damage, the transformer switches off at overloading and after reducing the load and cooling, the transformer is functional again. However, overloading has a negative impact on the overall service life. The transformer should be installed so that it can be accessed and possibly replaced at any time and it should be well ventilated. Installation in small, unventilated space reduces its service life. Please note that the supply voltage must comply with ČSN EN 60038, damage due to over-voltage in the electrical network is not a reason for placing a complaint. Complaints are solved by replacing the faulty transformer. Other costs related to replacing the connection are not recognised. Colour Rendering Index (CRI Ra) CRI Ra is the assessment of colour perception accuracy. Value Ra = 0 means that it is not possible to distinguish colours in this lighting. On the other hand, Ra = 100 means that we perceive colours as natural. The higher the CRI Ra number, the more natural the colour display. However, even the natural daylight almost never has Ra = 100. It is affected by clouds, smog, sun position (morning, evening), etc. Transformer power (W) = x + 20% (30%) x = LED strip length (m) × LED strip input power (W/m) Example : When using a strip with 14.4 W/m and length of 2.5 m, the power of the strip is 36 W + 20% reserve (7.2 W), i.e. 43.2 W. You will thus need a transformer with more than 44 W. Important warning – work rules Electronic components such as LED lights, sensors, etc. are equipped with a num- ber of sensitive components. In particular, plastics used all around us (garments, flooring, etc.) contribute to a high risk of their damage due to electrostatic charge. It is therefore necessary to respect necessary work rules. When working, use antistatic devices, or always secure earthing of the electrostatic charge before manipulating with these components. This can be ensured, for example, by touching radiators, metal pipes and other earthed objects (but, for example, plastic wiring does not guarantee sufficient earthing). Even a slight discharge has a sufficient power for causing an irreversible damage to some components. When working with electrical equipment, legal norms must be observed and the work should be performed by a competent person. CONTENTS