| For this example I will be using American mercury vapor (H-number), but this applies to American metal halide (M-number) and American high pressure sodium (S-number) as well.
The earliest mercury vapor lamps (medium pressure and early high pressure), were H1, H2, H3, H4, and H5. This makes sense, I assume they were numbered in the order that they were made, the first one being the 400W H1 medium pressure mercury lamp. But then, from H5 (obsolete 250W high pressure) we go right to H33 (400w high pressure). What happened to H5-H33? Were they all lamp designs that just didn't catch on? That is an awful lot of failed designs if that is the case.
This also goes for S51 (400W HPS), was there anything before that? I have never heard of an S1. How about M47 (1000W MH)? Anything before that?
Thanks!
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