Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Are these bulbs back lit? I bought some that only focused downward and did not light the pendant glass.
Document: Great light bulbs. I just ordered second package. They are slightly brighter than Samsung light bulbs I bought earlier in a store for $6 per light. Not sure how long they will last but so far I love the savings.
*10 pcs* MR16 20W 12V Halogen Flood Reflector Light Bulbs BAB 20-Watt LampI have track lights all over the house. they were here when I bought the place.They used too much wattage. these are fine. i have one right over my desk so I can see to type this.
It's difficult to tell from the image, but there is no glass cover for the light. The light is exactly what I needed, though.
These come in a plain box with 10 individual bulbs inside. They give off a nice crisp white glow - I haven't noticed any tinting of any sort but then I've only used them outdoors for landscaping.The biggest issue I have with these it that they have a high failure rate. I've had 3 not work out of the box and I haven't even tried them all so far.Note there is NO glass on the ends of these.
So far I have used 6 of the 10 bulbs in this package to replace bulbs in landscape spots. The open front of these bulbs make them much easier to insert and remove from the narrow openings in spot lights than those with glass covers. It is too soon to assess longevity but for the price, I can replace them several times compared to the price of similar bulbs in the home centers. When I need more I will certainly buy more of these.
This was such a great deal! These light bulbs have a slight pink glow on the outside, but I love it.
I needed to replace some bulbs that burnt out in my track lighting. These worked well and were a little softer light (which was good) compared to my last set.
These bulbs were much cheaper than the lock hardware store and worked equally well. I would recommend them for anyone who has an outside system to light up their house.
The glass cover expected was not attached...... as noted in the description  I had to add my own UV filter cover glass ...  but otherwise all was fine..
The failures only came to light after the return periodn expired.2. Cheap enough to just throw away.I can't recommend these bulbs. Next time, I'll pay a bit more and get some more reliable ones.
Answer: yes