Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: Will this fit on a vinyl post?  Our's are true 4" and one set I ordered won't fit it.
Document: Lights were not as bright as expected, but the do exactly what they say they are for. These lights fit perfectly on top of a 4 x 4 post.
All the earlier comments about the limited amount of light these solar caps produce are true. They should be used for accent lighting only. I serious doubt that I will replace mine with this same post cap.
Housing looks durable by does not fit a 4x4  post needs to be made to fit as it advertised(fit 4x4)
I really like the amount of light this product gives off. This cap is much better than the one I replaced.
I installed these lights a few months ago and they are all still working and staying on throughout the night. The only issue I had was with the installation. They did not fit easily over the 4X4 redwood posts. I had to sand down the posts in order for the lights to fit. Not that big of a hassle for lights that are so inexpensive and so far have worked flawlessly.
These lights are poorly made. They are a cheep plastic, do not hold power for more than 3 hours, and barely light up at all. One of the lights doesn't even work. I wouldn't recommend this item to anyone.
I just build a 8 ft by 24 ft deck and needed some lights to show the steps leading up to the deck. I did not want a bright light. These two work wonderfully. I have two 4 x 4 posts at the top of the steps and the light that is put out by just two of these lights is just enough to give light, but it is a soft light which is a benefit. I have a total of eight 4 x 4 posts.
I have had 4 of these accent lights installed on our deck posts for over 2 years. A couple of them needed new Ni-Cad batteries which are cheap and easy to install. Other than that they've held up very well even through our very hot 100 to 112 degree summers and intense sunlight.They charge all day and last well into the night.We recently removed a green house from the deck, exposing more posts which can now be seen from the house and back yard.
I purchased these lights to replace the exact lights I got last summer. I installed them on the posts of my black powder coated fence. They are really cute and I get lots of complements on them. The only thing I don't like is that two of them stopped working within 4 months. I tried replacing the bulbs but that didn't work. I decided it was less expensive to order new ones than it would be to return them or try to find someone to fix them.
I ordered 13 of these for a row of stair railing on our long front walkway. All in all they look great but two of them do not work and I'm going to have to return them. They are not really a source of light but more of a glow outlining the stairway.
Answer: yes