Comment by vbelenky | Hacker News Reader

Comment by vbelenky | Hacker News Reader

Parent Full thread

Here is a paper showing that the USHIO care222 module achieves an L70 of at least 10,000 hours: https://www.jstage.jst.go.jp/article/lsj/50/7/50_394/_pdf

Here is a poster with more data in the same series, showing that the L70 is about 13,500 hours: https://cdn.shopify.com/s/files/1/0694/8637/9189/files/24061...

I have never seen any other data for any other commercially available krypton-chloride excimer lamp besides this paper and this poster. All that is "widely documented" is manufacturers claims. The non-USHIO KrCl excimer lamps I have personally tested had L70s closer to 1000 hours, nowhere near 3000-5000 hours. Of course since I am involved in Aerolamp I am not a credible third party, but I am not asking anyone to believe me, I am simply explaining why I decline to believe this 3000-5000 hour claim that is presently without any substantiation whatsoever, not even a paper or conference poster.

Of course, a cheap 1000-hour bulb that is easy to replace and available from multiple manufacturers is great! For many people this approach makes sense. But it is not a 3000-5000 hour bulb and consumers need to know that in order to replace their bulbs in a timely fashion.

You will probably say that the paper and poster and is not credible third party data. This is why Aerolamp has submitted multiple samples to LightLab Allentown for lifetime testing. Perhaps you would be willing to do the same, given how frequently you emphasize the importance of third-party data?

>Here is a paper showing that the USHIO care222 module achieves an L70 of at least 10,000 hours: https://www.jstage.jst.go.jp/article/lsj/50/7/50_394/_pdf

The scientists who wrote this paper work directly for Ushio, correct? And it has not been replicated or verified in any way?

>I am simply explaining why I decline to believe this 3000-5000 hour claim that is presently without any substantiation whatsoever

Very sensible, it should be checked also and claims until then retracted.

>This is why Aerolamp has submitted multiple samples to LightLab Allentown for lifetime testing. Perhaps you would be willing to do the same, given how frequently you emphasize the importance of third-party data?

Sounds like a great idea, we have multiple new gas formulations to test and low-cost replaceable bulbs mean it will be easy to offer customers greater operating life as we improve them. Perhaps Aerolamp would also like to refrain from making any claims without third party data as well? It would be a good example for us to set.

Sure, I'm game! I can loop you into our comms with LLA and you can do the same, and they can send us both the results as they come in. OSLUV says they're happy to pay for it too so no worries about the expense

I really do think the ushio bulb will last 13.5k+ hours though, and that's a long time to wait--how about we publish the LLA results at 1000 hours, and every subsequent 1000 hour interval after that? At minimum, it should give us a sense for how the lamps are performing, even though we might not get the L70 lifetime for a while. Then, as soon as LLA has confirmed receipt of both our samples we can both retract our lifetime claims, at least until the first 1000 hour interval

Just let me know a good email for you and we can get the ball rolling on this, you can get me at vivian@aerolamp.net

Emailed!

Reply on news.ycombinator.com