A2 Answer: compared to HPS grow lights, LED grow lights shine in every way. In particular, the light intensity and heat that they put out is something to be admired.
To sum up, LED Grow Lights are better than HPS mainly at the following points:
1. Saving Money
75W LED Grow Light Can Replace 150W HPS Grow Light
|Grow Light||Type||LED Grow Light||HPS Grow Light|
| Parameters|| Ballast Type|| Electronic ballast|| Inductance ballast|
| Luminious Flux||6750 lm||6500 lm|
|Luminious Effcacy||90.00 lm/w||37.27 lm/w|
|Light Lifespan||50,000 hrs|| 10,000 hrs|
| Power Saving||Light Source Power||70w|| 150w|
|Power Saving Rate||57%|
| Electricity Bill Saving||Annual Working Time||4,380 hrs||4,380 hrs|
|Calculate according to 12 hrs working time per day average|
|Annual Power Consumption|| 329 kwh||764 kwh|
|Annual Power Saving||435 kwh|
|Electricity Price||1.3 RMB/kwh|
|Electricity Bill Saving||565.5 RMB/year|
|Others||Maintenance Expense|| HPS grow light lifespan is short, every year need maintenance expense|
But LED grow light can save this kind of maintenance expense
2. Light Intensity
A lot of people worry about the kind of intensity that LED lights can provide. Compared to HPS lights, the intensity is near even. What stands out is that LED lights can’t compete when measured based on standards for these kinds of lights. LED lights, in tests, out perform HPS lights every time, even if they don't seem to actually produce a more intense light. When testing them, LED grow lights were able to produce an even yield and seem to show that future advances in the technology will help increase the yield even more, especially when compared to HPS lights.
If you are using HPS grow lights and have to constantly battle heat, LED lights offer an incredible advantage. Rather than spending extra money circulating air and attempting to cool it enough to not burn your plants, LED lights can nearly touch your plants without harming them in any way. Of course, if you grow in cold weather, HPS lights might still be beneficial, although it might often be easier to simply heat the grow room, rather than run the risk of using HPS lighting systems. The heat output of LED grow lights might increase as they grow larger and larger, but the current kinds used by many growers are warm to the touch, with none of the burning heat that conventional grow lights offer.
LED lights have been tested on yield time and time again. Overall, most indoor growers that use HPS lights achieve a yield of 0.5g per watt. For comparison, LED lights usually achieve 1g to 1.5g per watt, making them up to three times more effective. With each harvest, you will have three times the product that you would otherwise!
The average HPS setup lasts for around 10,000 hours. That is a long time when it comes to growing, but LED lights take it so much further. An LED light setup can last for around 50,000 hours. That works out to 5 YEARS of quality indoor growing that is cheaper, more efficient, and easier than ever.
Compared to HPS lights, LED lights are much more versatile. The bulky HPS lights don't offer much in terms of versatility. LED lights, however, can be positioned around your plants and relatively close, due to the lack of heat that comes off of them.
7. Spectrum Flexibility
The spectrum of light that LED lights put out as well is specifically tailored for the flowering and vegetative stages of growth. HPS lights put out the entire wavelength, but LED lights focus on blue and red spectrums that fit the needs of the plant and makes sure that every bit of light is used specifically for a phase of the growth process. A lot of people try different combinations of red and blue to get the perfect blend for their own purpose.