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badbillybob

double ended HPS v single ended

ive just watched a yootoob vid about DE lamps v single ended , and the claim of 20% more par with double ended. 

Now im a cynical cnut most of the time and find this a bit hard to swallow. what do you reckon?

 

https://www.youtube.com/watch?v=D-cB1SallMg&app=desktop

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I'm fairly cynical myself BBB but I think the technology behind de lamps is fairly well established now and I wouldn't be surprised if those claims were fairly realistic tbh.

 

A 1000w de overclocked too 1100w can give 1200g yields if your groom is dialed in and your running a known clone.

 

200g = 20% (claimed and disregarding the fact your putting in an extra 100w)

 

Tuppence only obvs bro

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Posted (edited)

Heres some system level data for both a SE and DE 1000w hps light. Give and take a bit as not all reflectors/bulbs are equal. 

 

e2a Data taken from chilled grow lights website.

single ended

Optical Measurements
Radiant Flux, 350-750nm (W):
261.5
 
Radiant Flux, 400-700nm (W):
253.5
 
Radiant Efficiency, 350-750nm (Woptical /Welectric):
0.2543
 
Radiant Efficiency, 400-700nm (Woptical /Welectric)
0.2465
 
Photon Flux, 350-750nm (μmol/s):
1285.8
 
Photon Flux, 400-700nm (μmol/s):
1240.5
 
Photon Efficacy, 350-750nm (μmol/(s*Welectric)):
1.250
 
Photon Efficacy, 400-700nm (μmol/(s*Welectric)):
1.206
 
Color Rendering Index – CRI, Ra:
20.9
 
Centroid Wavelength (nm):
629.8
 
Electrical Measurements
Active Power (W):
1028.4
 
Power Factor (unitless):
0.9771
 
Average Voltage (V):
119.98
 
Average Current (A):
8.772
 
Frequency (Hz):
60.0
 

 

Double ended.

 

 

 

Optical Measurements
Radiant Flux, 350-750nm (W):
382.2
 
Radiant Flux, 400-700nm (W):
313.7
 
Radiant Efficiency, 350-750nm (Woptical /Welectric):
0.3641
 
Radiant Efficiency, 400-700nm (Woptical /Welectric)
0.2988
 
Photon Flux, 350-750nm (μmol/s):
1920.0
 
Photon Flux, 400-700nm (μmol/s):
1813.1
 
Photon Efficacy, 350-750nm (μmol/(s*Welectric)):
1.829
 
Photon Efficacy, 400-700nm (μmol/(s*Welectric)):
1.727
 
Color Rendering Index – CRI, Ra:
34.7
 
Centroid Wavelength (nm):
641.1
 
Electrical Measurements
Active Power (W):
1049.8
 
Apparent Power (W):
1067.4
 
Power Factor (unitless):
0.9835
 
Average Voltage (V):
240.29
 
Average Current (A):
4.442
 
Frequency (Hz):
60.0
Edited by diyleduk
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Alls I know is that i'm staying far away from adjust-a-wings at the moment after seeing someone on IG post the aftermath of a bulb explosion and fire they put out!

 

So that leaves Gavita units??

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1 minute ago, mr23 said:

Alls I know is that i'm staying far away from adjust-a-wings at the moment after seeing someone on IG post the aftermath of a bulb explosion and fire they put out!

 

So that leaves Gavita units??

 

And a dozen other manufacturers, sunstream, dimlux, lumii to name 3 off the top of my head..

 

Shop around.

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Just now, mr23 said:

Alls I know is that i'm staying far away from adjust-a-wings at the moment after seeing someone on IG post the aftermath of a bulb explosion and fire they put out!

 

So that leaves Gavita units??

Can happen with anything electrical, I had a old light cabling caught fire luckily was in and heard it crackling, and a self inflicted collapse of lighting onto nft trays melted them to the waterline, think they were running for 24-48h lol 

Decent newish equipment and a good dose of anti-stupid growings as safe as having a fridge.

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Posted (edited)

The de hps crushes single ended. 

 

Not only better output but also a more even footprint and better spectrum. The better ones are not too far behind Led. 

 

The problem with the gavita units for tents is the integrated ballast imo. Even more fecking heat to disperse and pinches vital headroom which is an issue with a light that needs 3foot of clearance. 

Edited by Sargares
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It's the 400v 1000w DE HPS Bulbs that give out the highest Umol and are the most efficient for the wattage used. I'm currently using a cheap Sol Digital one as I'm saving my £ because I'm more interested in the new 945w CMH Lighting that will hopefully hit the market soon and then I'll pay out to get a more "top shelf" lighting setup. 

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