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400 Watt Metal Halide equivalent replacement, 234 LED Array @ 156 Watts
400 Watt Metal Halide equivalent replacement, 234 LED Array @ 156 Watts


Teh "Susan" Lamp series developed by Lunera launched their first generation lights around 2014. These lights bost a 50%+ efficency improvement over Metal Halide with an output of around 15,000 lumens.
Teh "Susan" Lamp series developed by Lunera launched there first generation lights around 2014. These lights bost a 50%+ efficency improvement over Metal Halide with an output of around 15,000 lumens.


In particular the focus here is on the '''SN-VP-E39-400W-4000-G1''', there are also "250W" and "175W" lights in the first gen series.
In particular the focus here is on the '''SN-VP-E39-400W-4000-G1''', there are also "250W" and "175W" lights in the first gen series.
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* Schottky Barrier Rectifier (5 Amp, 100 Volt)
* Schottky Barrier Rectifier (5 Amp, 100 Volt)
** [[File:MBRD5H100-D.PDF]]
** [[File:MBRD5H100-D.PDF]]
== Power Profiling ==
The following is from a power test of the lamp using a large high current 120VAC rheostat to slowly ramp up the voltage and evaluate the current draw. Note that LEDs respond somewhat exponentially to voltage adjustments, and a current limited source is the proper way to power these, however this provides valuable information for the design parameters of such an application.
Orange meter is total Current into Schottky Diodes to LEDs
Yellow meter is RMS AC Voltage into Schottky Diodes to LEDs
Blue meter is total Wattage INCLUDING losses from rheostat
Actually LED wattage consumption can be calculated by Amps * Volts
Note that volts shown are AC, and feed into a Diode bridge, which generates a 4 Volt drop and rectifies to a DC voltage. So the actual power being consumed by the LEDs is:<br/>
'''(AC Voltage - 4) * Amps = Watts'''
'''Measured AC Voltage & Current'''
<pre>
Test  Volts  Amps  Watts
------------------------
#1    42    1    55
#2    44    1.5  83
#3    45.4  2    107
</pre>
'''Calculated DC Voltage & Current'''
<pre>
Test  Volts  Amps  Watts
------------------------
#1    38    1    38
#2    40    1.5  60
#3    41.4  2    83
</pre>
[[File:LED-42v.jpg]]
[[File:LED-44v.jpg]]
[[File:LED-45v.jpg]]




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