My headlights weren't that bad when I did this but now they look brand ...
920090
I used this in combination with the blue magic restoration stuff and this is what made the shine and clearness return to the headlights. My headlights weren't that bad when I did this but now they look brand new.
1499198
I did notice a better light from my headlights but it wasn't what I expected or what I had hoped to gain.
3615651
they are noticably brighter than my old headlights, the bulb has a slight blue tint to them. But when i installed them i noticed that they were not shining blue, the color of them is more of a bright white
4291263
I bought these for my 1995 Buick LeSabre, because the headlights seemed REALLY dim... They helped a bit, but I haven't really used them all that much.  I feel like they were a much bigger help in my '08 Charger when I changed to these back when I still had that car.  The other night it seemed like they made them fairly bright, but I drive the car pretty rarely, and the headlights/reflectors are pretty poorly designed in the first place, so it is sort of hard to tell.  From previous experience, I'd say that they make a decent difference for the better in more modern headlights. I don't know that they do much in older ones like in my LeSabre.
869574
These bulbs are definitely brighter and puts out a white beam instead of the yellowish tint I get out of my old Sylvania bulbs. It helps me see farther and wider at night which is a big plus. I don't think I'm blinding oncoming vehicles since I waited I few months after purchase before I posted this review and I have not gotten a middle finger salute yet...lol
I added some photos of the issues I had but I'm not going to blame the bulbs. I'm sure it would have been a plug and play if I had stockers on. The quick connector being too big was an easy fix so overall I rate these bulb 4.5 out of 5.

My car is a 2013 Chevy Impala LT with aftermarket Spyder headlights.

UPDATE
I'm changing my review from 4 to 1 star.

The bulbs lasted less than a year and I have 2 cars so its not like I used my Impala everyday. Way too much hassle to install and LED bulb doesn't last. I'll be buying a different brand to replace this.
1702693
Four stars because well LED doesn't travel the same distance as Halogen does, why? Haven't a damn excuse. These I fitted to my 2009 328i and believe me anyone who reads this review please consider checking your current housing and how everything is constructed and man I had to dedicate 4 hours to install these and well they flicker when the car starts it's not too bad but what I noticed is they don't stay on when all four of my headlamps are on they stay off opposed to my halogens that I had installed previously were always on, otherwise pain in the ass.
3582521
I can see some improvement in the amount of light.  The beams don't light up farther down the road than my OEM ones but the area they do light up is more bright and visible.
3091019
Only after about 1k miles one of the projectors has come loose and wiggles around when riding, looking like my headlights are flashing. Will update with pic and status later
4698528
Swapped my old Civic's headlight bulbs out with these and coupled it with a good scrubbing of the lenses so it's hard to say how much of the improved lighting was from the bulbs vs. the cleaning but the new color is much nicer on the eyes for long drives compared to my old yellowish bulbs
4254442
This product looks the same as my previous purchase, however, with my previous purchase the entire yellow rectangle lit up bright white. With these, only a small dot on each square of the triangle lights up. This makes the light look like a double layer of white dots instead of a single bright white light. I wouldn't buy these again. I suggest that before you modify the wiring or put the tape on them, that you hook it up to the car battery to see if it does what you want it to do. I wouldn't purchase these again, but they'll do for as long as they last.
4455073
My car (chevy cobalt) doesn't have great vision at night. I decided to buy some nice head lights for once. Yes they are brighter but that's really it, and not by much. Knowing what I know now I probably wouldn't have purchased them.
44870
I bought these as they were half the price of the Sylvania SilverStar zXe and immediately regretted it. The color emitted from my headlights had too much of a yellow tint to be considered White or Bluish-White as these are supposed to have. I have since switched to the Sylvania SilverStar zXe and have enjoyed those for the last 2 months I've had them. If you want something to look similar (note: I said similar, not the same) to HID headlights, check out the zXe bulbs. They look great in my Chrysler 300 while these CrystalVision Ultra bulbs made my car look much older than it should.
4461379
Made it seem like i was getting very bright headlights to my disappointment they very just basic yellow and dull
3572174
I received two different color headlights and they were a pain in the rump to change I'm so mad
1355506
Great headlights. I installed one and have a image with how different it is from original. Ill try to figure out how to post image asap.
2497717
The headlight halo was the style was looking for and being open semi beam instead of sealed beam way easier to change the bulb. But I did not find the bulb as bright as my sealed beams
3402902
I had tried a couple of other solutions to clean my headlights without sanding... including bug spray. However, after a brief cleaning with this stuff it was like I had brand new headlights. High beams were much, much brighter.