True? Some white LED's give more blue light (430nm-ish) than ACTUAL blue LED's?!

[jess_storm]

A quote from a seller on eBay who specializes in UFO-type LED growlights:

"Evolutions in the white HO LED actually produce more blue than blue LED's."

Does anyone have any evidence to show this is true? And secondly, I'm assuming this would be in the higher Kelvin range of cool white/blue (5,000k and above).

Love to hear input from anyone!

~jessie

 

[jess_storm]

Quick Follow Up:

A colored LED has a specific light wavelength, such as a red at 630nm (nanometers). But when it comes to white LED's, I'm running into trouble customizing my own light panel.

White LED's are rated in Kelvin. Unless I've made a mistake, Kelvin is the *average* color temperature . . . and unless you have a SPECIFIC Light Spectrum Graph for a SPECIFIC white light, you'll have only a ballpark guess of what wavelengths are being hit the hardest by that specific white light.

For example, a 5,000-10,000K LED means that the average color temperature is in the lower wavelengths (the blues), while a 1,000-3,000k would be more composed of long wavelength (the reds). But without a light meter that can test various wavelengths, we'd have very little idea whether a specific white light is hitting the optimal lengths.

Consequently, the claim in my original post about the efficiency of white LED's would be easy to test, if you had the right type of light meter -- which is probably HUGELY expensive.

It's about a billion-to-one, but does anyone have a light meter capable of measuring specific wavelengths? If so, I'd love to send you some white LED's and have you test them and post the results for the folks who are interested in LED grow lighting.

BTW, please correct any mistakes I've made!

Thanks,

~jessie

 

[FreezerBoy]

BTW, please correct any mistakes I've made!

Thanks,

~jessie

Never ask others for personal info. If someone asks for yours, just say no and report them to admin. We like to think of ourselves as family but, the truth is we're strangers. Please do not put your life, freedom and security in the hands of data mining strangers.

 

[jess_storm]

Never ask others for personal info. If someone asks for yours, just say no and report them to admin. We like to think of ourselves as family but, the truth is we're strangers. Please do not put your life, freedom and security in the hands of data mining strangers.

I appreciate the tip, but what are you referring to?

~jessie

 

[Weezard]

Da tip.

Da tip.

I appreciate the tip, but what are you referring to?

~jessie

Well, you could not send them white leds without an address, yah?
That's very good advice from FB.

As for mistakes in the original post?
630nm. is an orangy-red.
460 is blue, and I do not think it's true.
(White leds having more blue dan blue leds, that is.)

It has been my experience that ebay statements from sellers can be, um, less than accurate.

Testing the claim is easier than you might think.
Just requires a light meter and a blue filter.
Cheap n sloppy?
Use a gel filter on both kine leds.
Not accurate, but ainokea, we only care about more or less here.
Wanna get picky, use a large prism or a diffraction grating to pick out just the 460nm part.
Then eyeball 'em, or measure.

You mo' lazy dan me?
Just ask KNNA.
He'll get to da bottom of it.

Enjoy!

Weezard

 

[FreezerBoy]

I appreciate the tip, but what are you referring to?

~jessie

does anyone have a light meter capable of measuring specific wavelengths? If so, I'd love to send you some white LED's

How are you going to do this without exchanging contact info?

Do not ask for others personal info. If someone asks for yours, just say no.

 

[asde²]

ontopic: what he claims isnt true because its simply not possible yet(and will with the utmost probability not change in the future)

 

[SupraSPL]

KNNA had/has some blue 450nm that were (if i recall) over 40% radiometric efficiency. There are new white LEDs that can output more than 50% radiometric efficiency but I doubt that more than 40% of their light is blue even though they are made from blue chips.

On the other hand no eBay sellers are selling LEDs with that high of efficiency. My guess is they are in the 15-30% range. So if you had a 15% blue and a 30% white maybe that statement could become true.