Howard Industries HID, LED Cross Reference
HID to LED Wattage Cross Reference
HID to LED Wattage Cross-Reference
SCHOTOPIC/PHOTOPIC MULTIPLIER METHOD*
HID Fixture Info LED drive current = 350mA @25°C LED drive current = 500mA @25°C
Visually
HID Lamp
70W PSMH 4,400 4,589 85 36 4,538 58% 40 4,554 53%
100W PSMH 5,800 6,049 129 48 6,050 63% 53 6,034 59%
150W PSMH 10,000 10,430 186 83 10,462 55% 92 10,474 51%
175W MH 10,800 11,264 210 89 11,218 58% 99 11,271 53%
200W PSMH 16,800 17,522 234 139 17,520 41% 154 17,533 34%
250W MH 17,000 17,731 292 141 17,772 52% 156 17,760 47%
250W PSMH 19,000 19,817 288 157 19,789 45% 174 19,810 40%
320W PSMH 21,000 21,903 364 174 21,932 52% 192 21,859 47%
350W PSMH 27,000 28,161 400 223 28,108 44% 247 28,120 38%
400W MH 23,500 24,511 460 194 24,453 58% 215 24,477 53%
400W PSMH 31,000 32,333 456 257 32,394 44% 284 32,333 38%
70W HPS 5,350 2,322 91 18 2,269 80% 20 2,277 78%
100W HPS 8,550 3,711 129 29 3,655 78% 33 3,757 74%
150W HPS 14,400 6,250 185 50 6,302 73% 55 6,262 70%
250W HPS 27,000 11,718 295 93 11,722 68% 103 11,726 65%
400W HPS 45,000 19,530 464 155 19,537 67% 172 19,582 63%
Lamp Mean
Lumens
Effective
Lumens
Exiting Fixture
(Mean)**
System
Input Watts
LED
Equivalent
Input
Wattage
Visually
Effective
Lumens
Exiting
Fixture**
Energy Savings
LED
Equivalent
Input
Wattage
Visually
Effective
Lumens Exiting
Fixture**
Energy
Savings
PHOTOPIC METHOD
HID Fixture Info LED drive current = 350mA @25°C LED drive current = 500mA @25°C
HID Lamp
70W PSMH 4,400 3,080 85 52 3,063 39% 58 3,248 32%
100W PSMH 5,800 4,060 129 69 4,064 47% 76 4,256 41%
150W PSMH 10,000 7,000 186 11 9 7,009 36% 132 7,392 29%
175W MH 10,800 7,560 210 128 7,539 39% 142 7,952 32%
200W PSMH 16,800 11,760 234 200 11,780 15% 221 12,376 6%
250W MH 17,000 11,900 292 202 11,898 31% 224 12,544 23%
250W PSMH 19,000 13,300 288 226 13,311 22% 250 14,000 13%
320W PSMH 21,000 14,700 364 250 14,725 31% 276 15,456 24%
350W PSMH 27,000 18,900 400 321 18,907 20% 355 19,880 11 %
400W MH 23,500 16,450 460 279 16,433 39% 309 17,304 33%
400W PSMH 31,000 21,700 456 368 21,675 19% 408 22,848 11 %
70W HPS 5,350 3,745 91 64 3,770 30% 70 3,920 23%
100W HPS 8,550 5,985 129 102 6,008 21% 113 6,328 12%
150W HPS 14,400 10,080 185 171 10,072 8% 189 10,584 -2%
250W HPS 27,000 18,900 295 321 18,907 -9% 355 19,880 -20%
400W HPS 45,000 31,500 464 535 31,512 -15% 592 33,152 -28%
*Scotopic refers to visual perception in low light , photopic refers to color perception in normal light . The ratio of Scotopic light vs. Photopic light is called the S/P ratio.
This ratio determines the apparent visual brightness of a light source. Higher S/P ratios appear brighter to the human eye. See:
“Energy Efciency Consequences of Scotopic Sensitivity”, Dr. Sam Berman, Journal of the IES, Vol 21 No.1, Dec. 1992
“The Coming Revolution in Lighting Practice”, Dr. Sam Berman, http://www.lightenergysource.com/ScotopicTechnical.htm
**Scotopic/Photopic ratios used: MH/PSMH = 1.49, HPS = 0.62, LED (6500K) = 2.14. HID xtures assumed to be 70% optically efcient., actual efciency will vary. Mean
lumens of 95% used for LED.
The HI Lighting Calculator is provided to assist users in making lighting decisions based on various assumptions, factors. and methods. Efforts have been made
to ensure accurate assumptions in developing this tool, however, HOWARD INDUSTRIES DOES NOT WARRANT OR GUARANTEE, EITHER EXPRESS OR IMPLIED,
THAT THE RESULTS OBTAINED HEREIN WILL BE OBTAINABLE UNDER ACTUAL USE CONDITIONS. HOWARD INDUSTRIES IS NOT RESPONSIBLE FOR ANY
LOSS RESULTING FROM THE USE OF THIS TOOL.
Lamp Mean
Lumens
Lumens
Exiting Fixture
(mean)**
System
Watts
LED
Equivalent
Input
Wattage
Lumens
Exiting
Fixture
Energy Savings
LED
Equivalent
Input
Wattage
Lumens Exiting
Fixture
Energy
Savings
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