Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: If the UV Light is on can you see it? Are you exposed to the UV light?
Document: The LED light is very bright and the humidifier does make a boiling sound when working. These issues don't bother me, but I can see how they may bother light sleepers.Overall it does the job and I would recommend it.
The light would come on, but no steam. My husband is quite handy, so he tried taking it apart to see if there was a loose connection someplace, but we could never get it working again. I would never buy this product again and I am very disappointed to have to start my research all over again.
Using this in a high-ceilinged bedroom, it's helpful running at medium speed. We noticed a difference the first night. An impulse buy, I'm embarrassed to say, and I didn't see any mention of energy consumption. Digging on the Web, I find it's listed at 250 watts. The light is bright, so we put some tape over it: easy fix, if not aesthetically pleasing. oh well.
I don't need a light to let me know that the thing is working. It is nice that it tells you when the water level is low, but you can also see that from looking at the transparent tanks.-I'm concerned that the push-button on/off switch will wear out faster than the main unit. A switch seems like it would be a better choice.Overall, I'm pleased with this purchase and would buy it again.
Last month I purchased another unit that ran out of water in the middle of the night. This one does NOT have that problem. Even on the highest setting it's running about a day and a half! Beautiful.The 'on' light is way too bright but a piece of black tape fixed that. You can't see any light from the germ light (that's good). It does it's germ killing on the water before it hits the hot plate.
This does everything the previous great reviews said it would. It is easy to fill, last longer between fills and does a great job adding much needed moisture to the air. We use it in a very large master bedroom with vaulted ceilings. The only downside is that darn blue light. I like it, helps me see to the bathroom at night. Hubby hates it, so we just put a book or something in front of it and it works great!
It fits perfectly and protects the wooden dressers underneath.PURCHASING CONSIDERATIONS:  I didn't mind the water bubbling noise. The blue "ON" light was SO bright, you can't even look at it straight on. What's the point of such a bright light on this machine??? I put one of my baby's stickers over it, and it was still illuminating a corner of the room. You can't really see the vapor, but I notice that the water in the reservoir is nearly empty the next morning.
It came with 3 mineral pads that simply lay on a hot plate (use just 1 pad). Note they are the 'small' round pads. I see two sizes on Amazon.No other light comes from the unit. Gurgling isn't as bad as some other units I've tried but there is no way around a bit of gurgling.The TWO water side tanks can both be filled or just one. Lifting one tank off the unit while the other is full causes NO problems, water doesn't gush out.
The UV light is nice. The unit operates reasonably silent.
Remember-like any humidifier unit, this one needs to be cleaned out at least once a week (I do it every other night). My allergy specialist (a surgeon) recommends cleaning it daily, but who has the time? So the UV light is not an excuse not to clean the unit. Definitely recommended.
Answer: You can't see it while in operation.  You can, however, get a small glimpse of it if you take the right tank off the unit, and peak through the small water flow hole while in a dark room.  You can see a faint glow through the hole.  I've never seen it on the outside of the unit while in operation.  The light is completely contained inside the unit.  You might be able to get a glimpse of it if you really looked, as others have said below.  I've not been able to see it on the outside at all.  If you're worried about the UV light leaking, it isn't an issue.