Now IDAS LPS-D2 48mm and 52mm are commercially available.


Here is the actual measured production data. I’m not sure other suppliers publish “measured production value”. As far as I saw, mostly “designed value”. The design value is the good hint of its filter performance. But that doesn’t describe the “actual performance” as the commercial unit we receive. So production value is much more important for us.


Sorry, this is a temporary image. Too many curves in one place. We are preparing for the more viewier-friendly version for all 4 LPS filters, which allows us to see each lamp emission separately without clicking. Please wait for that.

Following plots show how LPS-D2 works with high pressure mercury emission lines. It is not intended for thought, just for your info.


As shown above, D2 doesn’t block Mercury’s 436nm and 547nm lines. The imaging sensor has good sensitivity around this region. So if your sky is dominant by high pressure mercury vapor, LPS-P2 and LPS-D1 are still good choice for you. Meanwhile your sky is heavily polluted by high sodium vapors and/or white LED, LPS-D2 should be perfect solution. I will test and show you soon. The filter choice depends on your sky condition. Anyway, our new page makes it to see easier. BTW low pressure sodium vapor is blocked by all 4 filters including LPS-V4.

Finally IDAS LPS-D2 should be the 1st filter in our industry to be considered for the modern light – white LED. I applause IDAS to prepare the possible future light pollution now as the market leader.



~ by tedishikawa on February 16, 2018.

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