Color and brightness I bought the 5000 K color (daylight) ...
597652
Color and brightness
I bought the 5000 K color (daylight) clear version . It does not have the yellow tint nor the bluish tint. It is installed in the kitchen area. It appears to be much brighter than the fluorecent lamp it replaced; event though, both have about the the same lumens. My old Philips fluorecent T12 type is rated for 2,325 lumens, but it fades over time. The Hyperikon LED  is rated for 2,340 lumen and it does not fade as much overtime.

Efficiency (money saving)
My old fluorecent T12 tube uses 40 watts; where as,  the Hyperikon LED uses 18 watts. It means it costs less than half to operate the LED when compared to the fluorocent tube. But this is misleading. If you live in Alaska and the lamp is used in heated area, there is no energy saving at all. If you live in Houston where air condition unit runs almost through out the year, your saving will be much higher. Here is the reason why? The fluorocent light in my case uses 22 Watts more than what the the LED tube uses  for about the same light output. Energy is neither created or destroyed; it just changes form. Where did the extra 22 Watts of electrical energy go? It is converted to heat. In case of Alaska, the heat from the lamp warms the room and the heating furnace does not have to work as hard. In case of Houston, the heat generated by lamp is not desirable. The air conditioner has to work extra to remove the heat from the room. Air conditioner are not very efficient at removing heat. The highly efficient AC units require about 2 watts of electrical energy to remove 1 Watt of heat. In Houston, the 22 Watt  extra heat generated by the fluorocent tube will require 44 Watts of electricity to remove it using the AC unit. That means the fluorocent lamp effectively requires 84 Watts to operate! Replacing a fluorocent tube with LED light tube is really a no- brainer if you live in the southern states of USA. It pays for itself in less than a year. With the LED lamp prices dropping, it will save you money over time even if you live in moderate climate states. LED lamps lamps also last longer; therefore, you do not have to replace them as often.

Installation
The Hyperikon lamp is shipped with protective plastic cover over the lamp pins. The instruction that came does not mention this. The tube does not  fit with the plastic part on the pins and you could damage the lamp holder if you try to install the lamp.
In my case, the ballast for my old fluorocent lamps had failed and I had to remove it. Once the ballast is removed from the circuit, you should never try to go back to a fluorocent tube lamp. The lamp will certainly gets damaged; I do not know what other safety hazard it poses.
1408003
A little disappointed of the color, these were more yellow than what I was expecting.  It looks a lot closer to 3500K instead of 4000K, meaning it doesn't give a "HID" look nor is it white in color.  I do notice that it's brighter than OEM and the spread of the beam is a little bigger.  I can't comment on the longevity just yet, but I assume that it won't last as long as OEM since these operate at a hotter temperature.  The price is excellent though, a pair of these bulbs costs as much as 1 bulb from another brand with the same quality.
1459494
Purchased these for the bedroom but found the bright daylight color to be to much for the application. Returned the bulbs without any hassle or problem and purchased the 2700K bulbs  which turned out to be perfect for the application. In my opinion, this supplier offers very high quality products at a fair price and are hassle free. This review is completely incentive free.
4179292
The color was not as warm as lights I replaced.  I'll get used to them though.
2150588
I bought 2 of these 5500k bulbs.
One looks 4500 and one looks 5500.....how about that, people.
I'm not happy I should have stuck with my usual ..the retrofit source for headlight equipment
4565570
Just used my first one of these.  I suppose the quality is first rate; the bulbs are bright and reach that brightness instantly.  Still, the light is a harsh blue white light.  Just like a florescent bulb; I feel like I'm sitting under a corner street light.  Give me the warm yellow light of an incandescent bulb!

I was contacted by the seller who pointed out to me that I ordered the daylight color, and hence the blue white color.  I will order the soft light color now and expect it will address my color issues.  As far as lasting 40,000 hours ... I'll have to get back to you on that
4465109
So these lights are not daylight color despite the packaging and bulbs saying daylight. However, they are not so yellow as the soft white lights. From the picture you can see an actual Zilotek 800lumens daylight bulb and the Tiwin 1100lumens daylight bulb purchased on the right. While brighter, it's definitely more yellow than it should be(I focused on the lightbulbs so you can see the actual color, that's why the room looks so dim). Thankfully I got six, and was able to switch out all the bulbs in the room but I definitely would prefer the whiter color. Only reason I've decided not to return it for now is because of how bright the lights are which is what I wanted.
4557002
These produce a "daylight" color as advertised but are not nearly as bright as the bulbs I originally had. Their light is also more directional. Luckily I have another light in the room as this one is no longer sufficient. I would go with the "LOHAS 6-Watt Dimmable" LED bulbs I got for another room if I were to do it again. They are a bit brighter and light is more even. Overall these are satisfactory but there are better choices out there.

UPDATE: 5 months after I installed these one burned out. Since this was a five pack and my fixture holds four, I had an extra. Also, the color seemed to get "cooler" over time. The lights were almost blueish in color after a few months of use which is harsh at night and a bit eerie. Now that I installed the 5th bulb I can really see the difference in color from new. The new bulb produces a more natural daylight color and has remained that way for a few hours now. These are just not great quality products.
1746175
i have the 2700k version as well but these 5k ones are super bright white! Great price for a 6-pack , would suggest this product.
2661502
This is a review on the Sunlite ETC/LED/5W/E26/CL/D/ES/27K 2700K LED bulb. First of all, this specific color in my opinion is great. I am replacing this incandescent light bulb. Aside from the physical size of the diameter of the bulbs, the brightness is way better. There is one thing, however, that I am not quite sure if I like, and that is the actual design of this light bulb. Overall, I think this is still a great product despite of the few things that I found a bit annoyed. The light bulbs are great. They went into a fixture which are short. Regular light bulbs peeked out of the fixture so that you could see the tip of the light bulb. These light bulbs did not extend past the light fixture opening. They are perfect for my application. I would more than likely purchase more of these to compare when I move into my house. I really like the brightness color and the fact that it would be only running at 5W's rather than the 40W of the previous bulbs I had installed. Hope you found this review helpful. I received this product for a discount in exchange for a fair and honest review.
325129
I'm giving 4 stars bc the headlights aren't 100% the same color. Both ballasts I'm using are innovited 55w ballasts. As you can see in the pic the left headlight is noticeably more yellow than the right and looks to be closer to the 5000k than 6000k. I do a lot of night driving and this is mildly annoying. Other than the color mis-match the lights are working fine so far.
2766561
Too bright and much whiter than advertised 3000K, more like 5000K. I returned these and bought Philips 457044 65 Watt Equivalent BR30 instead. Much happier with those, which are close to the 75W br30 incandescents I was replacing.
226062
These bulbs are really nice.  I did not install them with dimmable switches so I can't address how the dimming capability performs.  These bulbs are bright and put of a really white light. 5000k
2917631
I didn't buy them here but since I already have this product I wanted to share my feedback here.  I bought two boxes for 4 bulbs so I could use them on my 3-light fixture in my hallway bathroom (my other bathroom has incandescents which I'll replace w/ LEDs when they burn out).  I even bought two other 3-bulb GE Bright Stik sets each, one warm white and one daylight, just to see how they looked for comparison's sake.  I used the Reveals for a while, experimented a week w/ each set, then I switched back to the Reveals today.  All were fine and I was more comfortable w/ the soft white, but the Reveals continued to satisfy me that I'll probably stick with it.  The Reveals appear a bit pinkish next to a soft white or a daylight bulb.  The daylight, although nice and bright, was too sterile that on some mornings I'd use another source of light instead.  Anyway, if you'd find soft white or daylight somewhat uncomfortable for you, the Reveals may be worth your while.  Very soothing that it's worth my recommendation.

P.S. I also want to add when I tested a Reveal in a lamp, I did find the 60-watt (not 40-watt like above) somewhat not bright enough (I eventually switched to a 75-watt daylight LED--a better fit for me w/ this lamp), apparently due to the almondish color of the shade in question.  The Reveal in darker shaded fixtures (not to be used in enclosed fixtures, if I understand right) might be more suitable in higher wattages depending on the size of the lighting area and other factors.

Hope this helps.  Thank you for reading.
4831719
Brightness and color are good.  Tried to make this work with a light sensor so that it would come on at night and off during the day, however in that configuration the bulb barely lit up.  But if I removed the sensor then the build works great, and looks like the original post lamp halogen bulb I had in there previously at a fraction of the energy usage.
666716
The light color is too peach-toned for my liking, I prefer the 4000K model.  Like I mentioned in my review for the 4000K "Carlin" model, these aren't intended for fully-enclosed fixtures, so keep that in mind.
2188461
I purchased the 4000k (Daylight Glow) version and, overall, I am happy with my selection.  I purchased these for my kitchen to brighten it up.  The color temperature is perfect for that - bright, but not over-powering.  The kitchen has slanted ceilings and with the open floor plan, if I purchased regular flood lights, they would also shine into my living room where I want a warmer feel.  These allow me to point them straight down and keep the areas separated.

My reason for knocking off one star is because I wish the Color Rendering Index (CRI) were better.  You can definitely tell that some things look a bit off.  It's slight, but noticeable. Having searched Amazon for days to find these (4000k, gimbal mount, 14watt, dimmable, etc.), I am definitely happy with my choice, though.