Edition 1.1
(c) 1999 Bill Williams
PAR64 lamps -1000 watt, 120 volt
Use this QUICK REFERENCE TABLE to determine ILLUMINANCE (in footcandles)
or SIZE of any lighting area, for any PAR64, at any DISTANCE.
| Distance: | 10' | 15' | 20' | 25' | 30' | 35' | 40' | 45' | 50' | 60' | 70' | 80' | 90' | 100' | |
| Wide Flood Lamp: FFS
cp: 40,000 24x48 45x71 |
400
4.3' 8.6' |
178
6.5' 13' |
100
8.6' 17' |
64
10.8 22' |
44
13' 26' |
33
15' 30' |
25
17.3 35' |
20
19.4' 39' |
16
21.6 43' |
11
26' 52' |
. | . | . | . | |
| Med. Flood
Lamp: FFR cp: 125,000 12x28 21x44 |
. | 556
3.2' 7.5' |
313
4.3' 10' |
200
5.4' 12.6 |
139
6.5' 15' |
102
7.6' 18' |
78
8.6' 20' |
62
9.7' 23' |
50
11' 25' |
35
13' 30' |
26
15' 35' |
20
17' 40' |
15
19' 45' |
13
22' 50' |
|
| Narrow Spot
Lamp: FFP cp: 330,000 7x14 14x26 |
. | . | . | 528
3.1' 6.3' |
367
3.8' 7.5' |
269
4.4' 8.8' |
206
5.0' 10' |
163
5.7' 11.3' |
132
6.3' 12.6 |
92
7.6' 15' |
67
8.8' 17.6 |
52
10' 20' |
41
11.3 22.6 |
33
12.6 25' |
|
| Very Nar Sp. Lamp: FFN
cp: 400,000 6x12 10x24 |
. | . | . | . | 444
3.2' 6.4' |
327
3.8' 7.6' |
250
4.3' 8.6' |
180
4.9' 9.7' |
160
5.4' 10.8 |
111
6.5' 13' |
82
7.6' 15' |
63
8.6' 17.3 |
49
9.7' 19.4 |
40
10.8 21.6 |
|
| 400
4.3' 8.6' |
Footcandles (central beam)
vertical beam spread horizontal beam spread |
NOTES ON TABLE
1.) Candlepower (CP) divided by distance squared = illuminance (fc or lux) at any distance.
2.) Both the horizontal and vertical BEAM then FIELD angles are shown under each lamp. To determine area size: Width = .018 x angle x distance. You will need to determine both horizontal and vertical angles.
3.) This table uses the BEAM ANGLE for all area calculations (where central cp. drops to 50%). The FIELD angle may also be used for area calculations (resulting in larger areas) however for entertainment lighting, the BEAM angle is where 'noticeable' drop-off of light occurs with a PAR64 and it is this angle that should be used for most calculations.