Comments

Author Comment Last activity Moderation
jeffh "Glass absorption tends to increase at shorter wavelengths, but it varies strongly with the type of glass. Here's a link to plots of absorption in s..." | Read more » almost 5 years ago
jeffh "The variation in wavelength you're seeing probably is normal variation in the manufacturing process for LEDs. Their wavelength depends on the parti..." | Read more » almost 5 years ago
jeffh "Very nice work. I checked the listing for the lamp, and if you are using the original bulb, it is a "warm white" with color temperature of 2700 deg..." | Read more » over 6 years ago
jeffh "There are tradeoffs, but it's certainly worth trying violet/UV LEDs. The wavelengths are roughly equivalent, but the LED emits across a broader ran..." | Read more » about 7 years ago
jeffh "Very nice experiment, and a great set-up for measurements. I bought a 405-nm laser a couple of months ago, and that's a much better wavelength for ..." | Read more » about 7 years ago