non-UV purple

[nass]

see if you can limit his text colour choices? Testy isn't he, lol

[gdesmo]

Typical jerk that does not bother to read the rules first and then whine and bitch when he doesn't get his way. Time to grow up !

[10e]

Accosted.

LOL

Instead of just waiting until the link gets approved they just ran off.

[Neo182]

Will do. Byesies!

[Scotophor]

Hi, I am looking for non-UV purple LED's to put inside my Corsair 900D case along with my PETG tubing. I have read that extended periods of exposure to UV light can make PETG tubing unstable. Most sites through which I search, though, have only 'UV purple' LED's and not just regular, 'non-UV purple' LED's. Could anyone direct me to a site or sites (competition lowers prices) that actually have non-UV purple LED's?

C'n guys, this is juniour high school physics ... Purple = UV.


after 410nm glowing effect goes down to hill.

DazMode, there are different shades of "purple", just like every other (insert name of color here). Besides "violet" (near-UV; ~400 nm), it is also possible to produce "purple"-ish shades by blending blue with red, as has been suggested by other posters recommending use of RGB light strips. For reasons unknown, to most people this technically "magenta" combination looks very similar to violet.

Hardliner, there are in fact non-UV "purple" LEDs available, though they are very hard to find. They typically use a blue LED chip combined with a red-emitting phosphor. This same technique is used to make so-called "pink" (really magenta) LEDs too; the difference being that "purple" LEDs typically have less of the red phosphor, so they look more bluish. See http://www.ledmuseum.net/ledpur.htm for photos and spectrograms of part numbers SSL-LX5093VC (Lumex) and ETG-5AX420-15 (ETG). This page is quite old, but I know that the Lumex part is still available. You can also get this 5mm Violet LED from superbrightleds.com too.

Those are all 5 mm (T-1 3/4) through-hole component LEDs, so you will have to solder them and provide the correct current-limiting series resistance yourself. I've been trying to locate 3 mm (T-1) non-UV purple LEDs for myself with very little success. This LC LED-300TP4G is the only one I've found so far, but it's rather expensive at USD $1.58 each with a minimum order of 15 pieces. Australian website ledsales.com.au has this round-topped and this flat-topped version, both of which they call "pink" but appear more like purple in their photos. I'm not sure if I want to try them yet. Similarly, Futurlec has this 5 mm and this 3 mm LEDs which they call "purple", but their so-called "datasheet" links don't actually provide full data (no wavelength or spectrogram info), so it isn't possible to determine if they are phosphor purple or UV purple. I've tried emailing them but got no response yet.

HTH

[DazMode]

Indeed. I have some Pink LED that in fact Blue with red phosphor coating. White are also just Blue with yellow coating.

On practice I noticed that even Blue and RGB Purle make thing glow as well, so I do see any solution around it.

[Scotophor]

UPDATE: rapidonline.com sells a line of LEDs in a wide palette of novelty and pastel colours called TruOpto. You can get them in 5 mm T-1 3/4 and 3 mm T-1 sizes. The LEDs are cheap enough, but shipping outside the UK and EU is very expensive for small purchases -- they don't seem to offer the inexpensive "small packet" option, only DHL at a minimum of about USD $30. They have at least 3 shades in the "purple" range: Magenta, Lavender and Sakura. Lavender appears to be a noticably pastel shade; bluish purple leaning toward white, while Sakura seems to be a more saturated version of about the same hue (bluish purple with less white).

[Scotophor]

On practice I noticed that even Blue and RGB Purle make thing glow as well, so I do see any solution around it.

Blue light does stimulate fluorescence in many substances that fluoresce under UV. But just because blue light will also make them glow, does not mean that it is doing the same damage that UV does. I'm sure PETG tubing will last much longer under phosphor purple or RGB LED lighting than it will under ~400 nm UV LED lighting.

[Scotophor]

UPDATE: I found an eBay seller in the UK offering the TruOpto LEDs with much cheaper shipping to the U.S. I bought the 3 mm Sakura and Lavender colors. I also already have some of the 5mm Violet LEDs from superbrightleds.com, left over from a previous project. I wanted something to replace the keypad lighting in a vintage novelty landline telephone that I have. It's clear with interior parts painted white, and it's illuminated with a "U"-shaped neon tube that lights up a pastel purple, but the stock keypad lighting is from standard green LEDs, which clashes terribly, even though the neon tube and the keypad lighting are never on at the same time. I'm sure the phone was made when the only LED colors available were red, orange, yellow and yellowish-green.

Comparing these three purple LED colors, I found that the Violet from superbrightleds.com is fully saturated with no hint of "whiteness" at all but leaning slightly toward magenta (reddish). The Sakura by TruOpto is a somewhat white-ish medium pastel purple, almost a perfect match to the neon phone. The Lavender by TruOpto is almost pure white with just a hint of purple, much whiter than the photos from the sellers depict. No points for guessing which color I'm going to install in the phone!