According to the website below, they are blue because blue is the closest wavelength of the visible spectrum to ultraviolet light, and insects are attracted to ultraviolet light.
Various places sell bug zappers. Novelty stores are known to sell bug zappers, such as Socrates, or Eclipse. Many dollar shops also sell bug zappers are also known to sell bug zappers.
you can use ultraviolet in bug zappers, identifying money, in sun beds and many others:
bug zappers
Bug zappers contain 3 main parts: A transformer, Metal grids, and a light. Bug zappers typically use UV lights to attract bugs at night because bugs can see UV much better than other visible light and obviously they are naturally drawn to it. When the bug approaches the light an electrical arc is created across the bug which vaporizes the bug when it flies between two grids of metal spaced very thinly apart. In order to achieve such high voltages that can cause an arc the bug zapper contains a transformer that steps the voltage up from 120V to around 2,000V or more.
you can use ultraviolate in bug zappers and identifing money
Outdoors bug zappers and reducing lighting that might draw them to structure.
I'm sure you can get them somewhere online. search by bulb no.
Flies, mosquito's,dragonflies, fruit flies, even wasps and bees can be trapped. The bugs are attracted to the bright light of the zapper, and once inside the bugs are then electrified by the light and are killed.
While sitting outside during the warm summer months can be a great way to enjoy the weather and the company of friends, people in most areas of the country will find that the amount of bugs at times can be too much of a nuisance. Those that wish to sit outside and enjoy the weather should consider purchasing a bug zapper, which is one of the most effective ways of getting rid of bugs. While a bug zapper can be a great way to get rid of bugs, there are several things that should be considered prior to purchasing the bug zapper. The first factor to consider is whether you want to use the bug zapper inside or outside. Bug zappers are designed for either indoor or outdoor use. Bug zappers that are used inside tend to me smaller and more controlled than outside zappers. This is because they are not designed to handle as many bugs as outdoor bug zappers. If you are hoping to get a bug zapper to use outside, avoid purchasing one that is designed for indoor use as it may not be strong enough to handle your needs. Another facto to consider is what types of bugs you are trying to repel. Bug zappers work by trying to attract and then kill bugs. However, the way they work to attract bugs varies. Some work by giving off a bright light while others work by providing a certain scent, which attracts the bugs. Try to get an understanding of what types of bugs you are dealing with and what they are attracted to prior making your bug zapper decision. You should also figure out if you want the bug zapper to be mobile. In recent years, hand held bug zappers have become much more popular with consumers. These zappers are ideal for people that are looking to get bugs out of bushes or small crevices in the home because the zapper can fit into smaller places.
yes they kill more harmless insects than harmful ones.
The carpenter bee is not normally attracted to a bug zapper. It may accidentally run into one and die, but it won't fly into it on purpose.
Yes, there are some battery powered bug zappers on the market. You definitely won't get the same effect, however, as using a plug in version.