As I understand, you are searching for rogue wavelengths emitted by cheap bulbs. Unless the bulb is based on a UV emitter, you aren’t going to find any. You see, with LED technology, it’s just a single, 460nm (blue) LED emitter, dusted with a chemical cocktail that causes a conversion of blue light to a whole rainbow of other colors. Check out these readings from these 2 LED bulbs, one cool-white, and the other warm-white. The differences are just in how much blue gets converted by the coating.
To convert to anything outside of visible, would only dim the bulb. And home-lighting bulbs already operate at far lower output than the sun. To re-create that ‘feel’, you only need to buy heating lamps. A UV one and an IR one can be added to any room to give you the same warm feeling as the sun. Of course it comes with all the dangers of unseen radiation, as well as a power bill to boot.
With SOL 2835 3.2v SunLike TRI-R (3-R) from Smart Eco Lighting co ltd:
MASS 13D 60pcs SOL 2835 LEDs dimmable
~35$ Ø75.5x151.5(149)mm 231grams Δ41° E27/26 e14 B22
MASS GX53 48pcs SOL 2835 LEDs
~25$ 111 gram
MASS 7C 19w COB SOL
The same photo with 6C
~25$ E27/26 e14 GU10 gu5.3/mr16 B22
Compare of the size 11 and 13D
Futured bedtime bulb lamp with SOL SunLike 2200k 2250k
7w (asian style body with round diffuser) & 5w (special project body with round diffuser)
About discounts for MASS models
It was the reason why I created it
I think maximum discount will be 20-25% (with 6$ international shipping for any order) and will seems like that: 5+pcs = 5% discount; 15+pcs = 10% discount; 30+pcs = 15% discount; 50+pcs = 20% discount; 100+pcs = 25%
Wholesale price will be about 50% (without shipping)
I bought the Hopoocolor OHSP-350UV and played around with it for a few days. Compared with my Sekonic C-800-U, the OHSP-350UV looks and feels much more premium, boots up in 2seconds instead of 20seconds, measures many more parameters, nicer screen, much more responsive, and sensor accuracy seems comparable. They both give about the same values measuring the same sources. Only disappointment is that the OHSP-350UV does not measure TM-30. I miss the RG value, which is an important parameter that I pay attention to. Otherwise this is has the widest range I’ve seen for hand held spectrometers. It measures from UV-C all the way to infrared.
I was surprised to find out how extremely high the UV-C value is in my incandescent bathroom heat lamp. at about 12” from the lamp, the UV-C irradiance is 0.275 mw/cm2!!! This is as high or higher than some portable germicidal lamps!
Sars-Cov2 can be deactivated w/ 2-5 mj/cm2, which means about 10-20seconds from this heat lamp!!! According to safety thresholds, at this level of UV-C irradiance, the time of exposure cannot exceed 10-30s! WTF, how the heck can Amazon be selling something this dangerous!!
Great comparison SKV89, thanks.
I have to say, I use my C-800 way more than I ever expected. The plan was to test everything I owned, then re-sell it. But I’ve had it over a year, and I still need new readings and comparisons every few weeks. One of my new hobbies is growing Oyster mushrooms in a tote, and their light exposure affects their color, texture, and vitaminD content. So I am using the spectrometer to take readings from the best locations and simulate it with my selection of LED strip. It’s just awesome.
Put up a new light fixture in my office and tested some new bulbs. Ceilings are 14’ (don’t ask, I have no idea why) and it had a frosted flush mount light fixture with 2 garbage 2700K bulbs in it. Needless to say I needed WAY more light and something a little more unique for my uniquely tall office.
10 bulb Sputnik light @ 100% brightness (it’s basically outdoor level brightness on max ~800x10 diffused lumens?)
Sorry in advance for international people but this is a pretty good value for people with a ZigBee hub. It’s a house brand of Home Depot (US home improvement chain). It’s tunable from “2700K” to “6500K”
Here are some measurements with the light at 30% brightness:
2700,3000,4000
4500,6500
Considering I prefer ~3000K for indoor lights I am pleased.
Woah, that absolutely blows away my Hue Ambient, which are about Ra 83. Thanks for the tip, just ordered 8 to try. Love the Duv at 3000k, as that’s my go-to interior light.
Sunlike, have you considered Nichia V4 COBs?
According to my rough calculations, when underdriven they should deliver close to 140 lm/W at 85°C with CRI 9580.
This is as high or higher than some 
Below is a basic comparison of the spectrum emission compared to Citizen 97 CRI and Sunlike LEDs:
