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There is a nice write-up in Wikipedia on the MR-16 bulb. Here are the ANSI codes from that write-up. The following ANSI standard codes are used to designate certain power and beam angle combinations for MR16 lamps. Many manufacturers use these standard codes for lamps matching these specifications: • ESX: 20 watt, 10 degree beam (20MR16/10°) • BAB: 20 watt, 40 degree beam (20MR16/40°) • EXT: 50 watt, 15 degree beam (50MR16/15°) • EXZ: 50 watt, 25 degree beam (50MR16/25°) • EXN: 50 watt, 40 degree beam (50MR16/40°) • FPA: 65 watt, 15 degree beam (65MR16/15°) • FPC: 65 watt, 25 degree beam (65MR16/25°) • FPB: 65 watt, 40 degree beam (65MR16/40°) • EYF: 75 watt, 15 degree beam (75MR16/15°) • EYJ: 75 watt, 25 degree beam (75MR16/25°) • EYC: 75 watt, 40 degree beam (75MR16/40°) Note that MR16 lamps are available in many other power and beam combinations than those available above. For this reason, MR16 lamps are also often labeled according to beam spread abbreviations. Note that these while these abbreviations are commonly used, the angles associated with these abbreviations vary slightly from manufacturer to manufacturer. These are typical beam angles for these beam spread abbreviations • VNSP (Very narrow spot): less than 8 degrees • NSP (Narrow spot): 8-15 degrees • SP (Spot): 8-20 degrees • NFL (Narrow flood): 24-30 degrees • FL (Flood): 35-40 degrees • WFL (Wide flood): 55-60 degrees • VWFL (Very wide flood): 60 degrees or more Mike Reinath LNC2 875 Hrs N3602M (RHV)