Unlike other 2 color versions of bulb (3000k & 4100k lum, this states 1650 lum in title & 1950K in descrip. Does this lose lum over time vs others ?
1735025
Usually manufacturers add wattage to the 3000k to get them to the same level of lumens as a 5000k.
1735026
It is hard to tell, but I have not noticed any dimming. The last line in the Technical Details section seems to say that it dims to 1500 lumens near the end of its rated lifetime, but it has a long lifetime, and that sounds like something all LEDs would do.
1735027
Im pretty sure all LEDs lose lumens over time. Not enough to really notice. Lumens are the amount of light they put out. 3000 and 4000 k is kelvin which is the color temperature. The 4000k always put out more lumens per watt no matter what led it is. LEDs are naturally blue and they add tint to get them an incandescent color.
1735028
It appears to me that the importer is a bit remiss in dealing with the details. In addition to the discrepancy in brightness, he also lists two different wattage ratings. I suspect that he is now selling the 20-watt version of this light, vs. the older 18-watt version, and simply botched the ratings. (1650-lumens)/(18-watts) = 91.7-lumens/watt(1950-lumens)/(20-watts) = 97.5-lumens/wattBoth of these figures are VERY efficient, and replace fluorescent tubes VERY well.
1297787
I haven't noticed any loss, but we don't have it on very much and always for fairly short periods.
1435231
The one I received is not as bright as a 500 watt halogen fixture, although it is still very bright. The manufacturer claims 4500 lumens.
663293
I have been using mine for 9 months outside in hot and cold weather with no problems. If you haven't noticed, they have three different color temps for the bulbs, make sure they ship your preference. I have the White 6000K and the Warm White 3100K. The 6000K is noticeably brighter, but the light is bluish, similar to the color you might see in a car headlight.
977749
1700 according to package. I suggest you go to Lowe's: this is a "natural daylight" bulb, nothing special. I bought a 4-pak there for less than seven dollars. Only difference is the ones at Lowe's are 1600 lumens, which is insignificant.
1112588
The pkg. says that the color temp. is 2700K, which is what regular incandescent and CFLs are labeled as. However, I have some LED floods in my office that are 3000K which is a whiter light than 2700K and these Philips are more like the 3000K lights I have. I love them!
1043030
It is VERY noticeable, I have a 2700K and a 2100K right next to each other and the 2100K has more blue added to the spectrum, the visible light is somewhat purple whereas the 2700K is very red. The 2100K is marked "for veg and flower" I've never tried using it by itself but I imagine it would make a suitable light if you could only afford to get one bulb, it's not ideal for veg but it'll work and it's great for flower.
1681300
I'm thinking that the 2700K and the 3500K is the lighting level of the bulb in Lumens. The 3500K is a brighter light than the 2700K. You might Google "Lumens." I'm thinking that it shouldn't make much difference in the operation of the bulb as to generating heat, but not sure of this. I put in a brighter bulb in my house and haven't had any problems with it. I put in the larger number because that was the only one available. Incidentally, heat will degenerate the fixture if it is made of plastic so stick with the 55watts if you can.
293008
This model is 500 lumens. I doubt you would be able to tell the difference between the two different powers.
1413366
they don't say in the add, but appear to be the same color as my other under cabinet bulbs, 4100k.
479525
Hi Evan, I still have the light in it's original box, but it does not indicate Lumens. In fairness though, I've had it so long that the newer labels may reflect the Lumens number. Regardless, the unit lights up the engine area well, but it is just a standard socket, so you could buy a hotter one if you felt it was needed. Finally, this tool is excellent and is everything it advertised. Regards, Rossi
1511512
Maker replied me - it's in 5,000K. It's Kelvin btw. Still no words on lumens though...
1863703
I decided not to purchase this bulb; I went with a Bulbrite LED globe light instead. But....from the research I've done online, 3000K is in the warm range so it should give off a warm, slightly yellow color - as opposed to the 5000 to 6000K light which are cool and decided bluish in color. The Bulbrite light I bought is also 3000K and I like it very much but I prefer the warm light glow as opposed to cool. Hope this is helpful
150983
6000k is white with a hint of blue, 8000k is more blue. The higher the kelvin the darker the color and the less brighter the light. A lot of the brightness also has to do with the quality of the ballast as well as the headlight design.
2264491
I would believe that discrepancy is a typo. This type of light mush use a switch rectifier to convert AC to DC . It can handle 85 -265 V. I just used a photometer (the meter for photographic use) to measure the luminance (roughly means brightness) of this LED at a distance of 1 ft. It has about 4000 lux which can be converted to 4700 lumens. This is way above the nominal value of 2700 lm. I am guessing maybe 2700 lm is an average value during the life span. The LED I measure only a few months old. After 5 to 10 years it might drop to around2700 lm. Hope this helps, more or less.
2069093
I have no idea!..i do know that its on 2100 hrs and still as bright as ever and has performed flawlessly..so I will get another one for sure.at the price I paid I wont mind if it only last 2000 hrs but im sure it will last at least 3000
1270522
Hi Bill. I'm pretty sure its 2700K. If you get it and use it in a lamp where its covered, you will not be able to tell the difference between it and an incandesant bulb. Its that good. By the way Philips has a new bulb out now that is similar to this one but without the yellow panels and grooves. You might like it better if you are going to use the bulb where it will be seen when its off. Amazon has it if you're interested. It's 60 watts and you can get it in either 2700K or 5000K. I hope this helps you!
2238914
I can only speak for the one I received from seller "Wedoit"6000K, very white, no blue. Not a 6500K 'bulb'Almost 300 lumen IMO