LEDwholesalers MR16 UL Listed 5-Watt (35W Equivalent) LED Spot Light with Interchangeable Wide Angle Flood Lens 12V AC/DC (2-Pack), White, 1245WH

These bulbs are very inexpensive for LED lights, so they would potentially be a heck of a find. As with all LEDs these days, the question is one of color temperature. And as with most LEDs, unfortunately, they say warm white, but they are definitely on the cool sterile side compared to either quartz halogen or certainly regular incandescent. Also these are spot bulbs, and the center area is cooler in color while the outer ring area is noticeably warmer. It's not a huge color difference, and it's a gradual change rather than a hard line. And if the light is further away from the surface, it's not as noticeable. I have one positioned low over the kitchen table, about 30", and it's noticeable. At 48" for some reason it's not so bad.If you're not pointing these at white or cool tinted subjects, they're probably okay. Also, a lot of people seem fairly oblivious to what seems like obvious color problems. If you're one of those people, I would recommend these bulbs no question.If you're not one of those people - what these lights really need is a slight warming filter put on the plastic lenses. I put a half CTO gel in front of them and it helped immensely. That's a plastic filter film that lighting guys use on photo shoots and movie sets. It doesn't cut light output much at all. It's just a slight orange yellow filter and I'm not sure why the factory doesn't just build that color into the plastic lenses. This would be a 4-5 star light bulb at that point. And a slight warning: if you block the lower slots with a filter you may block airflow as well and cut the lamp life short.If the color problems weren't there, this is a heck of a light for the price. I paid a total of about $4.75 shipped for these 20W equivalent bulbs. Similar powered LED MR-14 spots costs more like $20 at this point in time (May 2012). I would actually say they are brighter than the halogen 20 watters they replaced. And at 3 watts, that is some of the highest efficiency you are going to find in lighting.So I really wanted to know if these are as efficient as they claim. Do they really draw only 3 watts? So I put one on a small 75W 12V solid state power supply, and plugged that into a Kill-a-Watt energy meter. Result: 3.5 watts. (A 20W halogen read 18.5W, a 50W halogen read 45W.)This is potentially not only an energy saver, but a chance to give your 12V light strings a break. It's very easy to max out a 12V circuit that typically has a 300W max transformer. Put some 20W and 50W bulbs on that and soon you're maxed and tripping the breaker. Not to mention the voltage droop at the end of the line, which can make the lamps at the end of the run noticeably dimmer than the others. And on landscape installations you never seem to have enough light. At 5-7 times the amount of light output, an LED like this can not only save you electricity, but give you significantly more light output as well without tripping the breaker. Add a few more lights and still burn only 1/4 the juice. Nice.So I haltingly recommend these lights, if you understand what they are, they might be great for you.

We had three 35W bulbs and five 20W bulbs for a total of 8 bulbs in our front yard. They were installed by a landscaper, so unsure of brand or reason for varying wattages. These are used in an urban environment for the dual purpose of ornamentally highlighting the home and for adding extra light (security) for passersby on the sidewalk. They aim light up the side of the house, through small bushes and small trees.Because LEDs are new I just ordered one of these 3W LEDs. I was concerned about color of the light, lumens, and width of the beam. I was also concerned about whether or not this MR16 LED would fit into the landscape light fixtures.We were unable to tell the difference between the color, lumens, or beam width between this LED and the pre-existing 20W and 35W bulbs. That raises the question of why we can't notice a difference between the 20W and 35W bulbs. After consideration, it's probably the outdoor use and application that makes it difficult to notice. The outdoor lenses are covered in dust and dirt. All of these lights shoot upward toward the house through bushes, trees, or other plants. 'We would, however, perceive a color change. We tried other LEDs inside the home and note that they have a green color compared to incandescents. In contrast, these 3W MR16's (warm white version) have a light color indistinguishable from the 20W and 35W halogens the landscaper had installed - presumably from home depot's lighting aisle.We'll probably order 7 more of these LED's, which will take our total wattage from 205W to 24W.The math is pretty interesting on this. Our electric cost is $.11/kwh (from electric bill). These landscape lights probably run about 12hours/day throughout the year (longer in winter, shorter in summer). An online electricity cost calculator says that the current 205Watt MR16 setup costs $98.50 per year. The new 24W LED system will cost $11.50 per year; electric bill savings of $87/year. Amazon is selling these for $12.50, so it's $100 for eight bulbs.Of course, the number of hours that the old bulbs last is much lower than the expected lifetime of the new LED's, which would be part of a cost-comparison, but that's really an open question. In other words, when CFL's were claiming great efficiencies and extended bulb life, we believed the packages but were disappointed. Some of the CFL's burned out faster than incandescents because we installed them into places with frequent on/off switching. For that reason, we'll just wait to see how this LED makes it through the winter.