I am trying to render a suspended lamp made of spherical glass with led source inside. Here is my reference image:Refernce image

I have modeled a very simple object made by 3 elements: - Light source: An hemisphere with emission material, like is in real world (see this diffuser for led: http://download.khatod.com/documents/pljt20_test_report.pdf). Light orange in the image. - A painted metal tube for suspension (dark orange in the image) - A glass sphere diameter 7.5cm with hole inside, like is in real world (black in the image). The glass is 3cm thick.


And this is my result (5000 sample), quite disappointing. enter image description here I tried many variants with Light Path in the glass material, different glasses roughness... without results.

Glass Material rendersettings

How can I improve? I would like my glass sphere will be "real". Many thanks!

Blend file:

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    $\begingroup$ Could you upload blend file to blend-exchange.giantcowfilms.com? It's hard to tell without some experiments. $\endgroup$ – cgslav Aug 1 '18 at 15:37
  • $\begingroup$ Hi, here is the blend: <img src="https://blend-exchange.giantcowfilms.com/embedImage.png?bid=5071" /> The HDRI is missing for file weight reasons. Thanks! $\endgroup$ – Project Aug 2 '18 at 10:30
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    $\begingroup$ I'm not entirely sure how this lamp should be built but I think the solution for your problem would be to add thickness to the glass part - separate it from the rest and add solidify modifier with 1-2mm. Also try to use only glass shader for it. $\endgroup$ – cgslav Aug 2 '18 at 10:49

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