Summary

Good combination of good wavelength and brightness for a low price. Last few, discontinued item. 

Takes standard batteries.  

 how UV light works and what it will detect (fascinating article!)

of what you will see with this (and all the other) UV lights.

Technical

UV Wavelength: 380nm

Size: 140 long X 50mm (widest).  5.5 X 2 inches.

LEDs:  41 LED UVs

Output: unknown

Battery: 4 of AAA-size

BATTERIES

Takes four AAA batteries (supplied).  

Best alkaline (typically £1.00 to £1.50 per battery*):

- brightest for:  2 hours (1 hour at its very brightest then 1 hour not quite so bright)

- then, over the next 3 hours, it gradually dims, it still "works" but not at its best

- it is still 'lit' for another 10 hours but too dim to be of use

Cheapest (typically 10p to 20p per battery*):

- brightest for: ¾ hour (¼ hour at its very brightest then ½ hours not quite so bright)

- then, over the next 1 hour, it gradually dims, it still "works" but not at its best

- it is still 'lit' for another     hours but too dim to be of use

* This is just an example of the quality of battery, standard alkaline batteries are supplied with this item.

Further information

:

• what it is (and fascinating facts)
• different types (and their applications)
• general examples of items lit by UV light

of what you will see with this (and other) UV lights:

• Paper (banknote, stamp, security marking)
• Uranium glass
• Porcelain repair detection