Well i did some research of my own on the glass materials "Aluminosilicate glass has aluminum oxide in its composition. It is similar to borosilicate glass but it has greater chemical durability and can withstand higher operating temperatures. Compared to borosilicate, aluminosilicates are more difficult to fabricate. When coated with an electrically conductive film, aluminosilicate glass is used as resistors for electronic circuitry" Why and how that is worse than the borosilicate glass and its effects on the photon flux emissions? xD i need some insight on this.

I tried to PM you but i couldnt as i am quite new to this forum..i also added you on msn to further discuss your suggestions as i am working with a manufacturer of induction lights and LED lilghts and we can customized the lamps to the smallest detail so before i suggest to do some changes to the R+D dep i need some proof that this is what the customers are needing and what is best for the product itself as not only photon flux emissions count but durability of the materials are needed to be accounted too as one of the key advantages of induction lighting is the long lifespan they have.
Concerning the new housing fixtures we basically replaced the IP67 housing lighting fixture because we thought who will need a waterproof housing if it's mainly going to be used indoor..for outdoor purposes we have induction spotlights,street lights, etc and plus due to the glass housing fixture the kelvin temperatures rise by 25% in the long run and this has been one of our client's concerns so that's why we planning to changing it and i believe this would have an impact on the PAR values but i am not sure as i need someone to come up with a journal so i can get those values as i cant do the experiments myself in China due to the high risks involved..but hopefully once i am back in Spain or the UK i will try them out in my own growop and post them here xD.