Light diffuser, anybody cracked it yet?

hyprc · Jun 17, 2018

atoll said:
From what I understand it very much depends on the thickness of the polycarbonate. I use the thinnest I could find at 3mm which allows more UV than thicker stuff to pass through. Polycarbonate used for say greenhouses is much thicker and reduced UV much more.

Granted it's been a while since I've ran UV tests in a lab setting, the lenses I was testing were a fraction of a mm thick so I don't believe so, at least not to a great extent.

OREGONIC · Jun 17, 2018

How bout this, less the 1 mm thick. https://www.ebay.com/i/230944937798...5%26rvr_ts%3D0c9a53991640aa66a3d1e7b2fff5d6b0

hyprc · Jun 17, 2018

OREGONIC said:
How bout this, less the 1 mm thick. https://www.ebay.com/i/230944937798?chn=ps&ul_ref=http%3A%2F%2Frover.ebay.com%2Frover%2F1%2F711-117182-37290-0%2F2%3Fmpre%3Dhttps%253A%252F%252Fwww.ebay.com%252Fi%252F230944937798%253Fchn%253Dps%26itemid%3D230944937798%26targetid%3D400470399596%26device%3Dm%26adtype%3Dpla%26googleloc%3D9061081%26poi%3D%26campaignid%3D1028603266%26adgroupid%3D51673439278%26rlsatarget%3Dpla-400470399596%26abcId%3D1130046%26merchantid%3D8005314%26gclid%3DCjwKCAjwjZjZBRAZEiwAPeLSK6OIEEvXKSPVZAGhUQ9avs2HRUNVVAQyDnA1Cg29UowOzoEQ9bJQrxoCIC8QAvD_BwE%26srcrot%3D711-117182-37290-0%26rvr_id%3D1567796753725%26rvr_ts%3D0c9a53991640aa66a3d1e7b2fff5d6b0

Looks like low 300nm range transmission is poor but 400nm+ looks to be pretty darn flat at ~90% transmission. Looks pretty good.

Sleepydoc · Jun 17, 2018

Check out this thread:
https://www.reef2reef.com/threads/diy-ai-hydra-26-light-diffuser.402013/#post-4814685

OREGONIC · Jun 17, 2018

hyprc said:
Looks like low 300nm range transmission is poor but 400nm+ looks to be pretty darn flat at ~90% transmission. Looks pretty good.

Where did you find the transmission numbers? You state 90% 400+ what percentage for below 300? Sorry if this is a dumb question this information is way above my head.

hyprc · Jun 18, 2018

OREGONIC said:
Where did you find the transmission numbers? You state 90% 400+ what percentage for below 300? Sorry if this is a dumb question this information is way above my head.

Some materials charts are easy to read some are tough, polystyrene was easy thankfully. I just googled "polystyrene UV transmission" and used the Image tab to find multiple analysis that agreed and confirmed they were for the material I was looking for

. Also, I used to work in optics (glasses) for a while...