Summary

The most versatile, zoom in (fine beam, very bright) for distant objects, e.g. in a museum or for use in bright light; zoom out (wide beam, not as bright) for wide-area scanning of stock, banknotes beads etc.

Takes three AAA batteries, included. 

 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

Size: 95mm long X 18mm dia,  (3¾ X ¾ inches)

Weight including battery: 55g

Light source: LED chip, Korean

Wavelength: 365nm

Output (electrical): 3W

Output (light intensity): radiant flux* 700-900mW
* Like lumens.  But lumens only refer to 'white' (visible) light. 

BATTERIES

This item takes four AAA batteries (supplied).  

This can take a  (plus ) - optional extra. 

- brightest for 5 hours (3 hours at its very brightest then 2 hours not quite so bright)

- then, over the next     hours, 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

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

- brightest for 9 hours (4 hour at its very brightest then 5 hours 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 5 hours but too dim to be of use

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

- brightest for: 40mns (20 minutes at its very brightest then 20 minutes not quite so bright)

 - then, over the next ½ hours, it gradually dims, it still "works" but not at its best

- it is still 'lit' for another 7 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