FAQ page


Which light spectrum comes with which lamp?

Our luminaires are designed to fit into the growth purposes of spectra, thus each light series comes with a different set of available spectra. Information about available spectra can be found on every product’s page.

The choice of luminaire depends on the physical space you are growing plants in (greenhouse, growth chamber etc) and the choice of spectrum depends on what you are growing and in which stages.

Should I worry about Ultraviolet Light (UV)?

UV Light

The CMH spectrum also contains UV-A, UV-B, and UV-C. Because UV-C is harmful the glass envelope of a CMH will block that spectrum leaving only UV-A and UV-B. MH has no UV spectrum. Because this research remains somewhat speculative and can be dangerous, SpecGrade does not integrate this spectrum into our grow lights.

Why is a full spectrum light important?

Every plant on earth has over 5 million years of DNA based on sunlight, which is, of course, full spectrum. Our grow light simulates the sun based on proven spectra and runs at a sustainable energy-efficient intensity. It’s designed to successfully augment the photosynthesis process for optimum plant from propagation to flowering. 

Is spectrum or light intensity more important?

Once again, because each species of plant has over 5 million years of DNA, the crop and the region of the seed must be factored into the equation in term of how much light intensity is required. In addition, there is the Law of Diminishing Returns. In other words, the additional light intensity will be disproportionate to the electricity costs and to the amount of radiant heat that will ultimately impact the HVAC system. So, certain plants’ yield will increase as the light intensity increases, but at a disproportionate cost.

For example, by increasing the intensity (wattage) to max-out flowering of a cannabis plant at 100%, you would need to go all the way to ~1200~1500 PPFD, thereby nearly doubling the light intensity for a small 15% gain from 800 PPFD. So, just because a manufacturer may market a grow light to have the highest levels of PPFD, it doesn’t necessarily mean it is the best.

Why are UL and ETL (Electrical Safety) certification important when selecting my grow light?

To ensure electrical safety, make sure that the grow light has the mark of an independent third-party testing facility like UL (Underwriters Laboratory) and ETL. Request those test documents from any manufacturer you’re considering and then match them against the marketing materials and the mark for accuracy. Note that this is only one of many selection criteria.

What if the Growspectra Promo Code doesn’t work?

If the Growspectra Promo Code does not apply. Just try again and read the instructions carefully. If again it does not apply just check the validity of the code. The store also has 24/7 customer service to help you out.


HID lights do not deliver any significant levels of UVB since it’s filtered by their outside glass. No other LED grow light in the market covers the UVB spectrum to our knowledge since LED emitters are narrow band and focus their light in a narrow range. There are no cost effective LED based solutions to deliver UVB today. That’s why the SolarStorm employs T8 based fluorescent lights for UVB.


Growspectrum Infratech Private Limited is involved in activities such as (Real estate activities) Real estate activities with own or leased property n.e.c.


The Veg setting is recommended for the early phases of vegetative growth from initial seeds or clones through medium size plants. The Bloom setting is recommended for late vegetative phases and all bloom and flowering phases. The UVB setting is recommended for late flowering and finishing.

What is DLC and why is it important when selecting my grow light?

The DLC (Design Lights Consortium) is an independent third-party certification body that most utilities will commonly look to before considering any rebates to owners of indoor farming facilities. Before putting a manufacturer on their Qualified Products List (QPL) list, they are required to meet a number of performance criteria.