Question 1

Is the uv/purple option actually uv (usually 395 nm)? will it cause fluorescent objects to glow? i need to use it for that purpose

Accepted Answer

"UV/Purple" is a wavelength of about 395-400nm. This wavelength will cause a faint somewhat dim "glow" in florescent objects, BUT it will have a visible purple light emitting from the diode. This is because at 395nm more of the light emitted is VERY near the wavelength of regular purple light so you will get both lights (weak UV & regular purple) emitting from the LED. This LED emits more purple light than the useful UV you've after. It will work, but you will need quite a few focused at a single point to be of any real use for you. Also UV at the wavelength in my opinion is somewhat useless unless there are 20+ of them and you dont mind purple light flooding the area) . This type of UV is referred to as "Blacklight-Blue" because this UV source is a mix of invisible (black light)  but near the  blue light spectrum causing the purple.

Then there is "Blacklight-Black" Yep, this is like florescent Halloween lights that don't appear to be bright at all but things REALLY GLOW.

What you need is an LED with a wavelength of about 350-365nm. These do not emit much visible purple light but emit the INVISIBLE UV light that causes the glow you want, in fact at this shorter wavelength the UV light really causes a MUCH brighter and intense fluorescent glow, and without all the purple light flooding it. Most people tend to think they are junk and/or not working (due to the short wavelength UV light being invisible and not knowing that). They are more expensive but you get what you pay for. That's why some UV flashlights are very inexpensive (under $5) and others are pricey ( $50+) being of equivalent size but not even comparable in performance. Forensic UV light are this type (with few exceptions)

Question 2

So i ordered 2 bags of 100 white LEDs, why did 1 bag have 70 and the other had 69?

Accepted Answer

People can,t count.I had a order that was suppose to be 100pcs and only received about 40. Email the vendor.I emiled and received a full order

Question 3

what do i need to use to power these led diodes?

Accepted Answer

LEDs have a forward voltage drop for the color your using. I think white is around 2.5+ volts or so. If you plug one into a 12 volt supply by itself it will burn up. You can Google led resistor and use the calculator to find the resistor based on input voltage. Most LEDs can't take more than 20 milliamps.

Question 4

how many lumins does each LED give off for each of the 5 colors? (estimate?)

Accepted Answer

I make Christmas tree ornaments with them. 5 lamp topper star will light up a 14x18 room pretty well. About like a 40 watt reading lamp.

Brand	Novelty Place
Light Type	LED
Special Feature	transparent
Bulb Shape Size	T
Bulb Base	Prong
Incandescent Equivalent Wattage	4 Watts
Specific Uses For Product	UV light experiments, Counterfeit money detection, Invisible ink reader
Light Color	Purple, Blue
Voltage	3 Volts
Unit Count	100 Count
Number of Items	1
Brightness	300-400 millicandela
Shape	Reflector(R)
Material	Plastic
Model Name	Novelty Place 100 Pcs 5mm Clear Round Head UV LED Emitting Diode
Connectivity Technology	Normal bulb
Indoor/Outdoor Usage	Indoor
Controller Type	Push Button
Theme	Halloween
Included Components	100 Pcs 5mm Clear Round Head UV LED Emitting Diode
Power Source	DC power supply
Color Rendering Index	80
Beam Angle	30 Degrees
Power Consumption	0.07 Watts
Light Source Type	LED
Item Weight	1 Ounces
Light Source Wattage	0.07 Watts
Product Dimensions	0.5"W x 5"H
Control Method	App
Efficiency	[HIGH]
Manufacturer	Novelty Place
Part Number	A.LED.Diodes.Purple.100Pc
Item Weight	1 ounces
Item model number	Purple Light
Is Discontinued By Manufacturer	No
Size	100 Count (Pack of 1)
Color	Purple (Uv)
Finish	Clear
Special Features	transparent
Batteries Included?	No
Batteries Required?	No
Warranty Description	3 month.

Novelty Place 100pcs 5mm Clear LED Diode Lights - Invisible UV Transparent DC 3V 20mA Light Emitting Diode LED Bulbs - DIY Science Project Electronic Components Lighting Kit (Purple Light)

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