A few of us have been looking into those 50W (or 100W) LED Array chips that can be found on eBay in a variety of color-temperatures or wavelengths, such as:
<ul>
<li>10,000K</li>
<li>20,000K</li>
<li>455nm Royal Blue</li>
</ul>However, in the example of the 20,000K LEDs, people have said that they "look like" 16,000K rather than 20,000K.
So in order to measure what ranges of color these LEDs give off, you need a spectrum analyzer, or spectrum meter.
The "low cost" commercial meters still cost thousands of dollars.
Instead, a really inexpensive meter can be made using a webcam and some optical filters.
This site makes it easy, and even has a kit for $30:
http://publiclaboratory.org/tool/spectrometer">http://publiclaboratory.org/tool/spectrometer</a>
I'm going to get one of these kits, and put it through its paces.
I have samples of all three of the 50W LEDs listed above, so it should produce some interesting results.
<ul>
<li>10,000K</li>
<li>20,000K</li>
<li>455nm Royal Blue</li>
</ul>However, in the example of the 20,000K LEDs, people have said that they "look like" 16,000K rather than 20,000K.
So in order to measure what ranges of color these LEDs give off, you need a spectrum analyzer, or spectrum meter.
The "low cost" commercial meters still cost thousands of dollars.
Instead, a really inexpensive meter can be made using a webcam and some optical filters.
This site makes it easy, and even has a kit for $30:
http://publiclaboratory.org/tool/spectrometer">http://publiclaboratory.org/tool/spectrometer</a>
I'm going to get one of these kits, and put it through its paces.
I have samples of all three of the 50W LEDs listed above, so it should produce some interesting results.
