LED bulb manufacturers are developing 120/230V AC input led bulbs and 12VAC input LED bulbs (such as MR16 bulbs and similar products), each of which has a good reason for rapid development.
MR16LED bulbs have a huge advantage over CFL bulbs because CFL bulbs cannot be made very small. For this reason, LED-based MR16 bulbs are more energy efficient than any other technology. The 120/230 VAC input MR16 LED bulb is the most energy efficient compared to today's CFL bulbs (even if it does better in the future).
The main disadvantage of MR16LED bulbs is the electronic transformer. Most MR16LED bulbs installed today use an electronic transformer instead of a magnetic transformer to generate 12 VAC from 120/230 VAC. The problem is that electronic transformers are designed for halogen lamps, so most electronic transformers often cause flashing of LED lights. This incompatibility with some existing infrastructure may make them more difficult to accept.
Another limitation is heat dissipation: due to their small size, MR16LED bulbs do not dissipate a lot of heat. For this reason, the power of MR16LED bulbs is limited to around 5W, which makes them rarely used today to replace halogen MR16 lamps. The 120/230VACMR16LED bulbs are larger, so they can dissipate more heat.
All in all, I think that the recent 120/230VAC input LED bulbs will be the mainstream (60-70% market share), and the rest will be 12VAC input LED bulbs. In the long run, as LED lighting becomes more popular in the home market, the proportion of 120/230VAC input LED bulbs will likely increase (12VAC input LED bulbs will be less), and newly installed LED bulbs will avoid 12VAC transformers. It is powered directly from the 120/230VAC power supply.
Our recently developed 120/230VAC input LED driver is getting a very positive rating from the market. Our solution based on the MAX16834 provides outstanding dimming performance, allowing LED bulbs to be dimmed from 0 to maximum brightness using a standard TRIAC dimmer with no flicker. They can also be dimmed with a digital chamfer dimmer (like LutronMaestro), which is a very rare feature. In addition, these solutions can be designed without the use of electrolytic capacitors, which extends the life of LED bulbs, which are often the first components to fail in LED bulbs.
For 12VAC input applications, we have developed a unique solution that addresses the compatibility issues of electronic transformers. With its active PFC topology, it allows LED bulbs to not flicker when working with most electronic transformers, and can provide outputs greater than 7W with buck-boost or boost topologies. In addition, it does not require electrolytic capacitors, so its life is also greatly improved.
Overall, I don't think we are competing with Taiwanese and mainland LED driver suppliers because we are concerned about markets that require higher performance from drives, such as flicker-free dimming and compatibility with electronic transformers. Of course, as time goes on, we will increasingly compete with mainland and Taiwanese suppliers.
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