Spectrum King vs the competition. (Magnum 357 and Diamond XPS 150) - Surprising Results
Let me start by saying that I really like the Spectrum King. It’s sealed, and has no fan or moving parts. This is a huge plus for anyone who needs their grow to be quiet for stealth (or just because you don’t like noise.) It’s also cleanable with water, which could be a huge plus. Not dust or resin inside. And also no bugs inside! The Spectrum King also has a very pleasant light. It looks like sunlight to the eye, and feels like sunlight on the hand. I liked the promo material/videos for this light enough that I bought it new from the manufacturer. The other two lights I purchased used. If I had to sit in a grow space all day, the Spectrum King would be the light I would want to be used. The other lights, particularly the Magnum, are very funky to look at, hard on the eyes, and make assessing plant condition more difficult.
Let me first point out flaws I am aware of in the testing methods used.
- First, each light got a sample size of one. Though clones from the same mother, genetic abnormality could be at play here. From a statistics stand point, this might be the most significant flaw in the test. However, the throw of all three lights is not sufficient to flower a larger surface area than I used in my SCROG. Each light did approximately 6-7 sq feet, with some overlap. (see below)
- Second, all three plants were grown on the same screen, in an industrial rack that is slightly larger than 6’ by 2’. The SCROG growth ended up being about 3 feet wide and 7 feet long, as the plants tend to hang out of the defined space. This should have given the Spectrum King a slight advantage, as it was the middle light. Each of the end plants got their assigned light, plus a bit of bleed from the Spectrum King. But the middle plant got the full Spectrum King, and bleed over from lights on BOTH sides.
- Third, the Spectrum King was 4” higher (22 inches vs 1
than the other two lights, as measured from the glass. The inverse square law indicates that it will of course have somewhat diminished power if further away. However, I placed the lights at the manufacturer’s recommended minimum distance, and the Spectrum King has the highest rated light wattage (and highest draw at the wall.) My e-mail requests for clarification of the height measurement (glass vs LEDs) were unanswered by Spectrum King on installation, so I measured to the glass. Measuring to the LEDs would be difficult due to the shape of the housing. In the interest of fairness, I lowered the Spectrum King slightly to 22” vs 24”
- Fourth, the Spectrum King was new out of the box, the Diamond was used, but the “current” version, and the Magnum was used, but one version behind. (Should have been another advantage for Spectrum King.)
- Fifth, it is possible that the Spectrum King could flower a larger area if raised up (thus getting more bang for your buck), whereas the Magnum and Diamond clearly would not. But, the manual for the Spectrum King indicates a flower illumination of about the size I used at the specified height.
Those are the only significant flaws I am aware of. All other conditions were identical. Thus, even if the conditions weren’t ideal, they were uniformly not ideal and should have provided a good baseline for testing the lights.
I will also mention that the spectrum king has all 200+ LEDs in a puck about 4” square, vs the other two lights having their lights spread out over a much larger surface area. It seems that that would make it brighter in the middle, dimmer on the edges, and cause it to cast more shadows; perhaps not giving as uniform of illumination as the other two lights. However, there was no noticeable difference in bud formation or plant height over the entire area of illumination, so it seems the reflector is doing its job very well. Additionally, at ground level, the Spectrum King was the only light making significant penetration to the soil, and even to the floor below. It is entirely possible that SCROG is the kind of grow least suited for Spectrum King, and that it would/will do better in a regular vertical grow.
I will not claim to be a pro, as this is only my 5th grow, but I have a very green thumb. Spent my youth farming, and manage to very successfully grow more than 100 species of plants in my yard in California. I get plants.
Summary: In my grow, the Spectrum King just wasn’t cost effective. Not only was the Spectrum King the most expensive to operate in terms of power consumption, it had the highest MSRP and produced the lowest yield in my test. (Your growing style/technique may yield different results) I was hoping for superior results, but could have lived with just equal results because of the light’s other advantages. This was a huge disappointment for a light I really wanted to love. (Because I do spend a lot of time in my grow room, and hate the purple light the other lights put out.)
All wattages were measured at the wall (using a Kill-a-watt meter), and bud weights are dried and trimmed.
The Magnum 357, drawing 334 watts, produced 210 grams of dried/trimmed bud. (0.63 grams/watt)
The Spectrum King 400, drawing 491 watts, produced 175 grams. (0.36 grams/watt)
The Diamond XML 150, drawing 148 watts, produced 220 grams. (1.49 grams/watt)
The huge surprise here was the almost 1.5 grams/watt produced by the inexpensive and low power Diamond XML 150. In addition to being the most cost efficient, the diamond also has two dimmer switches, allowing the greatest versatility in light output. It runs amazingly quite compared to other LED lights I’ve used as well.
We did not weigh the trim from each plant separately, but we got about 170 grams of sugar leaf trim combined (dry weight). That’s a total weight of 775 grams (27 oz / 1.7 lbs). So, an average of half a pound per plant. I’m pretty happy with that.
A last note about SpectrumKing. Bigger than the disappointment in my grow was how SpectrumKing treated me when I asked to return the light. Their sales lead (yes, Brendan from the on-line videos) said my claims were unbelievable, and when presented with my grow log and final weights, simply stopped answering my e-mails. Diamond offers a 90 day risk free guarantee, which is long enough to flower plants and see how the light performs, and a 3 year warrantee. SpectrumKing, on the other hand, says they want you to be “completely satisfied with your purchase” yet offer only a 30 day return window, which of course is not enough time to see how it handles a grow. I was outside the 30 day window (obviously) by the time I harvested, and didn’t necessarily expect them to take the light back. However, their rudeness came as a bit of a shock, and they clearly don’t really care if I’m satisfied or not. It’s great to be proud of your product, it’s not so great to turn a blind eye to any information contrary to what you’d like to believe. I've joined the ranks of many nay-sayers who point out that they're hand picking their "competition" and have readings and results that don't seem to be believable. There are a lot out there if you look. Don't fall for the hype.