LED vs. HPS Grow Lights - Cost Breakdown!

LED vs. HPS Grow Lights - Cost Breakdown!

Paul
Paul
12 Oct 2018

Everyone knows LED lights are cheap to run. But how cheap is cheap? Can you save money by using them?

Actually, yes.

We did the maths, and found you’ll save up to £463 a year by switching from an HPS to a Telos LED light!

Save up to £463 a year Save up to £463 a year
Lower extraction costs in summer Lower extraction costs in summer

Within 2 years your LED pays for itself. After that, the savings keep spiralling!

You’ll actually save even more in summer – LEDs don’t emit much heat, so extraction costs drop.

Just make sure you pick a good LED. Cheap ones don’t emit enough PAR light, and don't have enough power to penetrate through the canopy! The problems you get can be so bad that you lose more in yield than you save in running costs.

Summary

  • Save up to £299 a year over average 600W magnetic HPS
  • Save up to £284 a year over average 600W digital HPS
  • Save up to £312 a year over average premium 750W digital HPS
  • Save up to £463 a year over average premium 1,000W digital HPS

Swaps

With a Telos LED, you get at least 2.1umol per W. That means you don’t have to go as high on your wattage to cover the same area.

We’d recommend making these swaps:

From To
600W HPS 1 x Telos 0010 or 2 x Telos 0008
750W HPS 2 x Telos 0008
1000W HPS 2  x Telos 0010 or 4 x Telos 0006 

Cost Breakdown

And now for the maths.

All costs have been based on:

  • 4 x cycles (504 hours veg + 672 hours flowering)
  • 14p per k/W energy
  • Recommended lamp + reflector swaps
 600W HPS (magnetic) vs. Telos LED
   1 x 600W HPS (magnetic) 1 x Telos 0010 2 x Telos 0008
Power draw  660W 300W  £480W
Electricity*  £434.65 £197.57  £316.11
Replacement reflectors  1 x £18  0  0
Replacement lamps  3 x £14.95 = £44.85 0  0
       
Total £497.50  £197.57  £316.11
 
Total saving =  up to £299.93
600W HPS (digital) vs. Telos LED 
   1 x 600W HPS (digital) 1 x Telos 0010  2 x Telos 0008
Power draw  636W 300W  480W
Electricity*  £418.84 £197.57  £316.11
Replacement reflectors  1 x £18  0  0
Replacement lamps  3 x £14.95 = £44.85 0
       
Total  £481.69 £197.57  £316.11
 
Total Saving = up to £284.912
750W HPS vs. Telos LED 
   1 x 750W, 400V HPS (Pro)  2 x Telos 0008 
Power draw  795W  480W
Electricity*  £523.56  £316.11
Replacement reflectors  1 x £29.95  0
Replacement lamps  1 x £74.95  0
     
Total  £628.46  £316.11
 
Total Saving = £312.35
1,000W HPS vs. Telos LED 
   1 x 1000W, 400V HPS (Pro) 2 x Telos 0010 4 x Telos 0006
Power draw  1060W 600W  720W
Electricity*  £698.07 £395.14 £474.16 
Replacement reflectors  1 x £29.95 0
Replacement lamps  1 x £129.95 0  0
       
Total  £857.97 £395.14  £474.16
 
Total Saving = up to £462.83

*energy cost calculations @ 14p per kW

4 full cycles of 504 hours veg + 672 hours flowering = 4,704 hours a year

X total light power draw = total watts used a year

/1000 = total kW per year

X 0.14 = cost per year!

example:

 
4704 hours a year x 300W = 1,411,200W a year

/1000 = 1,411.2kW

X 0.14 = 197.57

Running costs  = £197.57 using a 300W LED

Light Specifications
  1 x Telos 0006 1 x Telos 0008 1 x Telos 0010 1 x 600W, 240V HPS (Magnetic) 1 x 600W, 400V HPS (Digital) 1 x 750W, 400V HPS 1 x 1000W, 400V HPS
Power draw 180W 240W 300W 660W 636W 795W 1060W
µmol / joule
PAR light per Watt, per second
2.1 2.1 2.1 1.2 1.6 1.6 1.6
Total PPF
total PAR light, per second
378 504 630 792 1017.6 1272 1696
CRI 86 86 86 24 24 24 24
Spectrum 3000K 3000K 3000K 2100k 2100k 2100k 2100k

 

 
Paul
Paul
About the author

Paul is our Merton shop manager. If you haven't met him yet, he's as friendly as they get. 

GroWell Hydroponics Merton

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