Green laser pointers

All you wanted to know about green laser pointersAbout green laser pointersGreen laser pointers have been around for a few years but what are they? We have all seen the red laser pointer but green is completely different. The most common type are DPSSFD, ( diode pumped solid state frequency-doubled). They are much more complicated than standard red laser pointers because laser diodes are not commonly available in this wavelength range and are more expensive to produce. They are also 50 times brighter than red. With green laser's, you can see the beam as well as the very bright dot. Green laser pointers are the preferred laser pointer because green is the most visible laser pointer color. The reason why green is more visible is the human eye is most sensitive to green light. The other reason is the effect of light in the earth's atmosphere. Light is visible in the sky when the atmosphere scatters it and higher wavelengths are scattered more than higher wavelengths. Green is a medium wavelength so it scatters more and is more visible than longer wavelengths such as red.Class 3B lasers may have an output power of up to 500 mW (half a watt) and a laser with an output power of around 100mW and above is easily capable of melting black plastic, making holes in bin liners and popping black coloured balloons or balloons marked with a black marker pen. To give you an idea of what to expect, if you were to enter a room that is pitch black and used the laser on the ceiling, you would be able to see everything in the room. The beam would also be very visible looking like a green rod stretching out. When used outside, the beam seems to reach the stars. The power output of laser's are measured in mW (milliWatts) and can range from 5mW to around 300mW. of course the more power you have, the easier they will burn and the brighter they are.Infra red filter warningLaser pointers give out a lot of infrared light which you can't see making them less bright. Laser power meters however cannot distinguish between green light and infrared light. Some inferior laser pointer will normally be made up of mostly infrared light. For example a 100mW inferior laser pointer is likely to have a combination 20mW green (532nm) and 80mW infrared (808nm). All genuine green laser pointers and portable lasers have infrared filters inside them that blocks infrared light. Some laser pointers have had this filter removed or have been manufactured without the filter. Without this filter, these laser pointers are very dangerous because the infrared light can damage your eyes. All the laser pointers we sell contain the correct IR filter.What to look out for when buyingI have recently noticed cheap fake laser pointers selling at lower than trade prices. i.e. 100mw for about

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Feidaxin FD-150A/450A Programmable Handheld Radio

Feidaxin FD-150A/450A ProgrammableCompact TransceiverFeidaxin FD-450A is a UHF (VHF FD-150A) Two-Way Radio from in China.FD-450A covers 400~470MHz, FD-150A covers 136~174MHz. The Radio requires no computer/external device to program. TX/RX independent 99 Channel Memory capacity with 50 CTCSS, 104 DCS. A very rugged build radio, professional use in mind.

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used electrical goods, a safety warning!

Please be careful when buying used electrical goods, ensure the items have undergone an electrical safety test, the results of which have beenrecordedinto a PAT log book,make sure the item comes with an official PAT (portable appliance test) sticker attached. There are many fantastic bargains to be had on ebay but please remember, safety comes first.Pleasehelp others by voting YES below in so doing making this advice more visible in order to help make eBay a safer place to buy and sell

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Par Can Lighting - Explained!

OriginThe PAR can is an entertainment lighting fixture containing a PAR lamp. PAR is actually an abbreviation of Parabolic Aluminised Reflector; this reflector houses the bulb, and the whole unit is sealed with a glass front which acts a lens. The PAR lamp and the PAR can come in a variety of different sizes; the most common in the entertainment industry are PAR64, PAR56, PAR36, PAR30, PAR20 and PAR16 - the numbers referring to the diameter of the lamp in eighths of an inch. PAR56 Long and Short Nose The larger PAR64 and PAR56 cans are often seen in banks on stage, providing the basis of most gig lighting. They are both available with either a long or short nose - the shorter nose providing a wider beam angle - and also as a floor can model which has two yoke arms, allowing it to sit on the floor without the use of a stand. The PAR36 is often seen in nightclubs lighting mirrorballs; its 6.4volt / 30 watt lamp gives an extremely narrow beam and it is more commonly called a

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Advanced Ebay Antique /Collectable Pottery Seller Guide

HereTwo Important Points for Advanced Ebay Sellerswhich may help in gaining a higher price for your Ebay Auctions, when selling Antique and Collectable pottery. Have your Antique and Collectable Pottery Item auctions finishing at peak periods such as late evenings for the English, North American and Far Eastern Markets. You will gain a higher price if your auctions finish at peak periods. To do this you will have to know the relevent markets such as U.K. buyers prefer regional based potteries such as Staffordshire, Linthorpe or Troika. U.S. markets can be driven by periods such as Victorian, Art Deco Art Nouveau, Rococo, Georgian etc, Japanese and Far Eastern Buyers are often driven by the actual designers such as Clarice Cliff, Susie Cooper, Shelley

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Nimh - Ni Cad Better Battery Performance

NiMH - Ni Cad Better Performance of Rechargeable Batteries Before you believe you require a replacement batteryJust try this step first, remove your battery from your appliance, place your battery in the freezer for 4 - 6 hours, remove from the freezer, dry off any frost and place straight on charge forthe period of it's normal recharge cycle, this will remove any memory that the battery may have, if this process works then your battery is fine, this process can be repeated as often as you believe it requires, if this doesn't work then read on!Afew things to look at or look for when buying rechargeable batteriesThe number of recharge cycles the battery can doas per manufacturer Performance rating

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sky freeview viewing cards

Sky are currently offering freeview cards for

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