High absorption loss of ZWB2 filters

Flashlight Modding and DIY Parts
21

That is not hard, Matt and Hank specify what leds they use, all we need is to read datasheet.

22

so that is to say an emitter like the CUN66A1G would “harmonize” better with some/most(?) ZWB2 filters, if what you’re trying to do is disallow OTF wavelengths above and below 365nm? this is all genuinely fascinating. i think i enjoy “theory-crafting” even more than i enjoy building actual lights.

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23

This is a nice way to think about it. More precisely: given an LED, you want to choose a filter whose transmission spectrum “covers” the LED’s emission spectrum as much as possible. Conversely: given a filter, you want to choose an LED whose emission spectrum is covered by the filter’s transmission spectrum as much as possible.

Also, the goal is not necessarily to cut off everything that isn’t 365nm: because the spectrum is continuous, the fraction of emission exactly at 365nm is 0%! We just want to cut out everything that is easily visible, say, above 400nm.

Theory-crafting is indeed very fun, and IMO its importance is often overlooked. It is difficult to design a good product, or to make a well-informed decision about what to buy that does what you want, without a good understanding of the basic physical principles at play.

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