The 900-930 bulb is the genuine, original bulb that is sold by Haag-Streit. As of 2018, this bulb is made in Switzerland and may have alternative numbers on the blue & white box: 300353 or 7220770. Prior to 2018, the lamp would have had 0900.0930 on a black & white box. This lamp is intended to be used in the slit lamp models BA-904, BM-900, BP-900, BQ-900, BX-900, and the non-halogen Model 900.
What's the difference between the 900-930, 366 and 900-930-LS?
The 900-930 bulb is the original Haag-Streit bulb that is marketed and sold specifically for Haag-Streit slit lamps by Haag-Streit. This bulb is currently manufactured in Switzerland for Haag-Streit.
The 900-930-LS is the most similar to the Haag-Streit original bulb. It is assembled in the United States using the same lamps that Haag-Streit used prior to sourcing from Switzerland.
The filament is a different shape on the 366. The 366, on the other hand, is a more economical choice.