Lighting LED lenses?

[Chester]

@BigSm0 ... would you say that this statement is accurate ...

"... LEDs typically have a plastic or glass lens over the actual LED die (the name of the chip that actually produces light); this lens helps the light produced by the LED chip escape from where it is produced. Photons produced by the silicon chip (LED die) tend to be refracted back into the chip if the surface of the die is exposed to air-- "

 

[BigSm0]

Wow this is some deep shit. I don't think air has anything to do with refracting anything. Maybe slow it down but so marginal to even consider as a problem. I guess I'm no help lol

 

[nhdtjq]

@BigSm0 ... would you say that this statement is accurate ...

"... LEDs typically have a plastic or glass lens over the actual LED die (the name of the chip that actually produces light); this lens helps the light produced by the LED chip escape from where it is produced. Photons produced by the silicon chip (LED die) tend to be refracted back into the chip if the surface of the die is exposed to air-- "

I've heard every engineer I've spoken to tell me that the primary lens - that's the little plastic dome that covers most dies - is added because it improves light intensity.

It's something to do with the thermal environment at the dies chemical coating my uncle tells me.

The cob lights that come without a lens are used in flood lights. But I notice that the cob kits on Ali and some of the cob based grow lights have big primary lenses mounted...

Wow this is some deep shit. I don't think air has anything to do with refracting anything. Maybe slow it down but so marginal to even consider as a problem. I guess I'm no help lol

Not sure if itheyre not used in flood lights because of the reflector or because lenses of that size are expensive to make.

One thing I can say from my research is that lenses and glass panes will fluoresce away a portion of the UV.

Also lenses logically reduce PAR value because they affect how different temperature lights blend on the way to the canopy - with 60* lenses I can see the effect really well as the shadows it casts through the tent window are like rainbows, but made up of fewer colors.

With no secondary lens the primarily ones, usually 120* for single/double chips, blend at a short distance from the source.