What does PAR and MR mean in lighting?

Lighting terms can be confusing. In this video, David Geldart of Lumicrest Lighting Solutions demystifies the terms "PAR" and "MR" and explains the numbers behind the names "PAR 38" and "MR16".

[@oldyellerschannel4676]

Thank you!!
Your video is the only good thing that has happened so far today, in my search for Halogen PAR 20 50 W Range Hood Lights...seems they don't make them anymore!
At least now, I know what the terms mean!

[@stevealexander8010]

Great concise and to the point. But note that PAR alean means Photosynthetic Active Range (400-700nm)

[@mattmatt4916]

How great of you to Shed some Light on the Subject!! Thanks

[@bobgrow258]

PAR is also "Photosynthetically active radiation". These PAR values give you a general idea of how much light can actually be used by a plant

[@prsguitars42]

+Bob Grow .....or 'Pretty Asinine Ratio'........

[@joefialkowski8542]

Ditto Bob 😄😊

[@bertieb9510]

Thanks - exactly what I needed to know.

[@ragamuffinstv]

Really useful, just buying some stage lights and you've debunked some mysteries for me, thanks!

[@clubnv-phoenixarizona8301]

LOL LOL that's exactly what Im doing and for years Ive used these terms knowing what Im buying but never knew what the hell the terminology was :)

[@dallascalhoun3052]

Very helpful!

[@xowi]

Excellent tutorial, Thank You!

[@FriendLondonFriend]

2:12
That measuring system is probably no more obscure than saying my sister lives "2 tenths of a mile" down the street from me.
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I think that particular measuring of 8ths, may have been a feature of an ancient patent; something left over from days of light bulb development and the secrets associated with product development.
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You could look it up, David Geldart; get your secretary to find out for you on her weekend.
Thanks for posting this interesting video.
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0:15 eveything is just a light bulb: I had forgotten that there are still folk around like that, very funny !
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o0o

[@SkylerTauntsrandomstuff]

I couldnt help but press the sub button to ur informative vids

[@clubnv-phoenixarizona8301]

great video :)

[@SirDadbod]

I waited my whole entire life to know it was a measurement of 8ths? Just when you thought u knew something hahahah..

[@fakeapplestore4710]

Binge watching your videos

[@buffyplays2577]

as if the imperial system wasn't dumb enough...

[@sheikmunjah2241]

Thanks. 1 par = 1/8 in. Each inch is 8 pars. 4-3/4 in = 38 pars

[@lumicrest]

Well, "par" means Parabolic Anodized Reflector actually ... The dimensions are not pars.