The tables in this topic list some commonly used lamps values that you can use as a guide for defining photometric lights.

The information in the tables is approximate; however, you can refer to manufacturer’s documentation for more precise photometric data for these lamps.

General-Purpose Lamps

NoteIn the tables below, “Class.” stands for “Classification”; the values under “Intensity” are expressed in candelas.

Class.	Watts	Type	Intensity	Beam	Field
A-19/ Med	60	Point	70
A-19/ Med	75	Point	95
A-19/ Med	100	Point	139

M16 Low Voltage Lamps

Class.	Watts	Type	Intensity	Beam	Field
Narrow Beam	20	Spot	3300	6	12
Narrow Beam	50	Spot	9150	12	25
Medium Beam	50	Spot	3000	25	50
Wide Beam	20	Spot	460	38	75
Wide Beam	50	Spot	1500	38	75

Par36 Low Voltage Lamps

Class.	Watts	Type	Intensity	Beam	Field
Narrow Beam	25	Spot	4200	9	15
Narrow Beam	50	Spot	8900	10	15
Medium Beam	50	Spot	1300	30	60
Wide Beam	25	Spot	250	36	75
Wide Beam	50	Spot	600	39	75

Par56 Line Voltage Lamps

Class.	Watts	Type	Intensity	Beam	Field
Narrow Beam	300	Spot	68000	9	15
Narrow Beam	500	Spot	95000	9	15
Medium Beam	300	Spot	24000	18	36
Medium Beam	500	Spot	47500	18	36
Wide Beam	300	Spot	10000	30	60
Wide Beam	500	Spot	18000	30	60

Par38 Line Voltage Lamps

Class.	Watts	Type	Intensity	Beam	Field
Narrow Beam	45	Spot	4700	14	28
Narrow Beam	75	Spot	5200	12	25
Narrow Beam	150	Spot	10500	14	28
Medium Beam	45	Spot	1700	28	60
Medium Beam	75	Spot	1860	30	60
Medium Beam	150	Spot	4000	30	60

R40 Line Voltage Lamps

Class.	Watts	Type	Intensity	Beam	Field
Narrow Beam	150	Spot	5400	22	50
Wide Beam	150	Spot	1040	76	130
Wide Beam	300	Spot	1950	76	130