Not Compatable With All HPS Ballasts
343572
I bought 6 bulbs.  Within 2 days after firing them up, 3 ballasts blew their ignitors and had to be repaired.
3714680
Worked in my light fixtures that contained ballasts, but for the life of me I cannot get them to work when wired directly into the AC without ballasts. In the fixtures that they do work in one is much dimmer than the other in every fixture. This is a problem that could be solved by removing the ballasts, but since by my experience these lights won't work without them that wouldn't go so well.
3998989
The wires for mine were crossed, spent a while rotating ballasts and bulbs before trying the connection to the factory harness backwards. Then it worked. This means the clips don't hold the plug in, because they are on the opposite side. I have mine taped together. Also, the bulbs have an odd color. It's a blue light with some orange in it sort of. Not as bright as I expected either in my projectors. I may try some bulbs from another brand to see. Otherwise, was packaged well, the little brackets it comes with for ballast mounting are a nice touch too.
2530053
Great lights, not too hard to install, just be aware of the fact they can't be used with the ballast.
3219748
One of them didn't work, luckily I only needed one.

Seems like ballasts are very particular on bulbs, quality control is probably non-existant.
805970
I just received the kit today and already returning it, didn't install it though so I'm not sure how they look or work. The reason I'm returning it is that one of the connectors on one ballast was broken. The outside packaging wasn't damaged, the inside of the box wasn't damaged either and the packaging was good. Which tells me that the ballast was already broken before they packaged it up. Also, the bulb wasn't installed correctly in the socket because the bulb was crooked.
2488041
It works fine but I had to modify the harness connector  for it to fit. Hardness connector on ballast would not make proper connection.... Works fine now
4805994
The wiring instructions are tiny and appear on a small label attached to the part. Furthermore, the assembly has one more wire than the diagram shows. I've consulted electronics books and they have none of the symbols shown on the so-called instructions. The lack of an appropriate wiring diagram makes the ballast kit useless. I won't be ordering anything further from them.
1183767
The install was relatively easy, however these were advertised on amazon as 55W and both the ballast you need and these Xenon bulbs are 35W, in addition I purchased the 20,000K bulbs which came labeled as such and should be blue, but are not blue in the slightest, they're merely white and nothing else.
1589474
This is an edited review. My previous review was fairly positive: I loved the unit for the most part. Unfortunately, the ballast didn't last through eight months of (non-consecutive) use, and will no longer fire a Metal Halide bulb. It appears to work with HPS bulbs, but will not fire even brand-new MH bulbs which have been verified to work in the replacement ballast. I was working on the plants removing dead heads and checking fruit one day when it appeared that the bulb blew: A brighter flash followed by a rapid decrease in brightness until the room was dark. After checking with other bulbs, I discovered that HPS bulbs appear to work, while MH bulbs will not. Even though the ballast will fire HPS bulbs, it is clearly malfunctioning, and I am not confident enough in malfunctioning electrical equipment to risk a fire, so the entire unit had to be replaced.
4644183
I purchased these HID lamps because of their price and because of the generally good reviews. Unfortunately, I found that the HID Xenon Replacement Bulbs - D2S / D2R / D2C - 5000K from HID-Warehouse did not fit my 2012 Nissan Rogue. The male connector end of the bulb did not fit into the wired receptacle on my vehicle. Side-by-side the new bulbs looked exactly like my OEM bulbs. However, there was some very slight mechanical tolerance issue that prevented the new bulb from a clear path into the socket. As a result, I had to return these bulbs and purchase the more expensive OEM replacement bulbs. Additionally, I noticed that these bulbs are rated as replacements for the D2S, D2R or D2C. Although these bulbs are all mechanically interchangeable, they have slightly different designs. A fact that HID-Warehouse seems not to be concerned with.
4698368
Unless you're an electrician or equivalent, don't buy, you must remove and bypass the ballast, the ones shipped to me had been previously bought, installed wrong, blown and returned, I noticed this because two were missing end caps and protective film, so I tested before installing them and sure enough they were all blown. Pay the extra for tubes that will work with a ballast not these super cheap poorly made tubes.
2300535
I bought egt, trans, and turbo gauge.. They look great, but would look better if the leds worked in my turbo gauge. Was going to return untill i realised the hassle of uninstalling, an going out of my way to ship back.. Probably a fluke but not happy
2038681
Normal consumer will not have the information as to what type of ballast is incorporated in the system unless one goes and takes the darn thing completely apart, which obviously is not conducive to ones health, if I may state so.

I made the purchese based on the infromation LU 70 / Med / TU; Information available to any consumer from the sticker on the system.

As mentioned above the bulb is of no use to the system in use at the premisis. Got a new on locally which is working fine so far.
4692861
Purchased (6) of these to replace some GX24Q-3 can light bulbs in my house. The adapter did not fit into the socket. I had trim about .2 inches off the end. Once I did, it fit but was not a very reassuring fit for an overhead light bulb. The clips did not protrude as far as the bulb I was replacing. Lastly, if I had read some of the other reviews I would have realized that the can fixtures have an internal ballast, and as such, will not power up an led bulb.
2585266
Even though it showed that other people bought this with the light fixture we bought, these weren't compatible. Read specs carefully!
677980
they were working fine now both of my ballast aren't working and sometimes i have to turn on and off my lights for them to turn on