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As little as possible of course, that is what we all hope. There are however aspects we should not forget. An incandescent bulb is just a wire in a glass bubble, with a connector to power it. Fluorescent bulbs are different already. The glass production alone is more costly, and there is some electronics involved to make the glass tube light up.

With LED, the demands towards electronics are even higher, the space that can be used even smaller. Plus, not only are LED themselves still relatively expensive, they also need cooling, so even more costs occur.

But there is yet another aspect. If we want to use LED lighting to save energy, we should not use more bulbs than we did before, so the total market for bulbs should not expand. And here product lifetime enters the stage. An incandescent bulb has a lifetime of about 1,000h. For a fluorescent cork screw bulb the standard is about 3,000h or 6,000h. (Let's use 3,000h in this example.) For LED, many companies advertise 60,000h and more, but let's stick with more realistic 30,000h.,

Imagine a store selling among other items light bulbs. In previous years it was always selling 1,000 incandescent bulbs each year, and for the sake of simpler mathematics let us assume that one such bulb cost US$1 (or use any other currency you like, but let us stick to one unit of it).

Now the store shifts its bulbs from incandescent to fluorescent. Due to the increased lifetime, the store only sells 1/3 of the previous volume, so simply to reach the same revenue, the store needs to sell them at US$3. This does not consider the actual cost of the bulb, or how much energy costs you can save.

Then the store shifts to LED bulbs. Due to the increased lifetime, the store now only sells 1/30 the number of bulbs compared to incandescent, so to stay profitable, the store needs to sell one LED bulb at US$30.

The same applies to manufacturers and everyone else in the chain between manufacturer and consumer. You may say that US$30 is too high, but see it this way: During the lifetime of this one LED bulb you would have needed 30 incandescent bulbs – for the same total price. Plus, the LED bulb helps you saving on your electricity bill, by consuming less energy for the same amount of light. You see, whether the price of a LED bulb is “high” or “low” is a little bit more complicated to determine.

Many people have heard of "warm white" light, which usually means about 2700-3000K. Most people do not know what those numbers really mean and how warm for example 2400K light feels. For such times we made a small light box that allows easy comparison.

Color Temperature Comparison

In the upper right corner we see a very cold 5700K light, while the upper left corner shows regular warm 3000K light. In the lower two corners you see especially warm light that you can not get everywhere, 2400K and 2100K, which we offer in certain products. So compare for yourself and decide how warm a light you need. If you need extra warm, just call us!

We created a short video clip showing the color temperature changing capability of our new Regulus series smart downlights, to give you an impression what a color temperature change looks and feels like. The power is constant throughout the demo, only the color temperature changes.

Regulus 2

After our first smart downlight with a DMX-512 interface, Regulus 1, it is our pleasure to announce the second such product, Regulus 2. The specifications are pretty much the same, both products only differ marginally. Regulus 2 also features color temperature adjustment, from 3000K to 5700K. Should you have special requirements, like a wider color temperature range, just tell us, we can arrange some custom modifications for you.

Now you can choose between two designs, both giving you the same amazing functionality.

Regulus 1

We would like to announce the birth of a new line of products. Regulus is a series of smart downlights, currently equipped with DMX-512 interface. An outstanding feature is the ability not only to adjust brightness, but also color temperature. Whether you need a cold white light to keep everyone awake or a dimmed warm yellow light for a romantic atmosphere, you only need one downlight to do it all.

Each downlight requires two channels, one for brightness, one for color temperature settings. Any regular DMX-512 controller will work, our smart driver will do all the mixing. Should you require a controller, we can also supply you with a wall-mount model. We can offer the downlights alone or a complete solution, should you require one.

MoEA visits Yuehsin

MoEA at Yuehsin's booth

The city of Kaohsiung and the Ministry of Economic Affairs organized a Green Industry Expo on 2013-08-23 and Yuehsin Electronics was of course there. We presented current and soon-to-be-released products that can help to reduce our carbon footprint. If you could not be there, stay tuned here for the announcement of some amazing products.

A power factor (PF) only exists in AC applications, not in DC. It shows how well the voltage and current waves are in sync. With a resistive load like a heater or an incandescent bulb, we have the maximum of PF=1, meaning voltage and current are in sync.

Switching power supplies or other capacitive or inductive loads cause a shift between current and voltage. As a result, a device with a power factor lower than one needs more current to provide a certain amount of power. This causes trouble to electricity providers, so for a number of years most countries have established rules demanding that devices with high power consumption (like computer power supplies) must also have a high power factor.

The same applies to lighting. Bulbs with very low power consumption (<5W) are usually exempted, but for all other bulbs and luminaires a high power factor is recommended. To do our share in improving the stability of the electricity grid, Yuehsin Electronics is striving to exceed the required power factor in all relevant products, and you as a consumer can do your share too, by checking the specifications the next time you buy a bulb or luminaire, and reject one with a low (for example PF<0.65) power factor.

We often see people complaining that the light from LED bulbs does not look as warm and pleasant as the one from incandescent bulbs. This does however depend on the colour temperature of the LEDs used. Beside our regular "warm white" (3000K) and "white" (5700K) LED products we also offer a few models with incredibly warm light, at 2300 or 2400K.

Our candle lights for example are available in 2300K, but you can also find MR16 (12V, 5/7W) or AR111 (12W) with very low colour temperature in our assortment. We could even offer them in 2200K, but there really is not much difference to 2300K. So if you like some warm light: We have it!

We would like to thank everyone who came to our booth at TILS2013! There were many interesting talks and we hope we could satisfy your interest in our products. If you could not make it to the TILS, just browse our website or contact us right here on this site. See you next year!


Also this year Yuehsin Electronics will participate in the Taiwan International Lighting Show (03/26-03/29). If you want to learn more about our latest products or have any kind of inquiry, we welcome you at booth D0326.

See you in Taipei!