While browsing lighting videos on youtube, I found this video that features a very strange Osram mercury vapor reflector lamp that has the silvered reflector on the front face instead of the sides, which makes it seem like a reflector lamp for low glare applications requiring mercury vapor lamps.

Here is a link to the video shown below:

https://youtu.be/EtDyqFpJYio

 Similar concept to BT25's 250w Venture PSMH : https://www.lighting-gallery.net/gallery/displayimage.php?album=7419&pos=15&pid=187066

Hello Tim,

an interesting variant of the HQL/R type from OSRAM. I've never seen a lamp like this before, and I didn't even know it existed.  I'm surprised that this post has hardly had any comments so far.  It is not (yet) clear to me for what purpose this variant was used.

A most unusual design, I have also never come across such a type before.  It may have been unique to Osram Brasil.  It would be logical that it formed a very low glare lamp for high bay luminaires. 

About 30 years ago when the sudden acceleration of Chinese-made lamps began, I remember seeing similar types at Osram-GEC’s factory at Wembley.  They had sent drawings to a Chinese supplier to produce incandescent reflector photoflood reflector lamps.  The factory completely misunderstood the drawings, failing to appreciate that the ‘partially aluminised bulb’ meant that if should be coated on the parabolic rear surface.  They supplied samples just like this lamp with aluminium reflector over the front face, which caused quite some amusement and frustration of communication as the GEC engineers tried to explain that the aluminised and clear areas should be inverted!

my grand father had a bedside lamp that used a bulb with the top 1/2 mirror like this BUT was a round bulb and totally exposed with NO shade at all the the chrome was the shade