Review: SunLike9 SOL COB E27 LED bulb (4000K, CRI99)

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maukka
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Review: SunLike9 SOL COB E27 LED bulb (4000K, CRI99)

User SunLike from sunlikelamp.com sent me their SunLike9 COB SOL E27 LED bulb for testing.
Store page: http://sunlikelamp.com/index.php?route=product/product&path=59_98&produc...
Options as tested

The main specs by the manufacturer:
-4000K color temperature (also available in 2200, 2700, 3200, 5000 and 5600K)
-CRI 99
-A single SmartEcoLighting SOL COB LED
-9W power rating
-AC voltage of 220/230V (also available in 110/120V and 3-35V DC)
-Couple of options for reflector and lens instead of diffuser

See also my previous review of a bulb from SunLikeLamp.com which features four of the different color temperature COB LEDs:
Review SunLike10xss SOL Ultra High CRI E27 LED bulb

Measurements

Measurements were made in a 50cm integrating sphere with an x-rite i1pro spectrometer after the bulb had warmed up for 1 hour. Intensity (lux at 1 meter, candela) was measured outside the sphere at 50cm.

The bulb was connected to mains power which at the time of testing was at 230V.

Power consumption at the time of measuring the CRI parameters was 9 watts at 230 volts with a low power factor of 0.57. Total bulb efficacy is low but understandably so for an ultra high CRI light source at 73 lumens per watt. Remember that this bulb sacrifices efficiency for the ultimate spectrum.

Output at 1 hour is 631 lumens. The output drops just 5% during the first hour from 665 lumens at turn on. This is a sign of good heatsinking, which is also evident by just looking at the bulb.

Light output in lumens was plotted over one hour. Output is stable after the intial warmup.

Maximum output is reached immediately (90% in 0.6ms)

Color rendering

The CRI data was measured integrated after a 1 hour warmup in an integrating sphere.

Color rendering is practically ideal as seen from the smooth spectral power distribution (red line tracks the blue reference almost perfectly). CRI Ra of 99 and R9 of 99 and TM-30-18 fidelity index Rf of 98 and gamut index Rg of 100 are excellent. The phosphor mix manages to practically remove any bumps from the spectrum. There’s no near UV content.

Visually the light is neutral white with excellent saturation to all the colors it illuminates.

Load IES TM-30-18 Color Rendition Reports by clicking the thumbnails:

CGATS CRI Data file:
https://pastebin.com/sHi1jm3x

Color temperature and tint

Tint is right on the black body line. Remember that when LEDs heat up, their duv value almost always decreases and becomes less green/yellow. This was measured after 1 hour in an integrating sphere.

Tint is very even around the bulb thanks to the heavily diffused bulb.

Flicker

The switching frequency of of 90kHz with its minuscule modulation is not visible to the eye or to cameras. The snob index of 0% guarantees that it’s easy on the eyes.

AC power draw

Current is drawn in short pulses 100 times a second as the input voltage gets high. There’s no power factor correction which results in a power factor of about 0.6.

Cyan line: mains line voltage
Yellow line: current draw of the bulb
Violet line: power draw (voltage * current)

Verdict
Just like the multi COB lamp from SunLikeLamp I tested earlier, this neutral ultra high CRI bulb produces the smoothest spectrum of light out of all LED sources I’ve tested. The Chinese SOL COB LED emulates a black body radiator almost perfectly and also looks gorgeous. The light is flicker free and very stable in output thanks to the good heatsink and good driver. For under $20 I can’t think of a better bulb to get.

Please note that the test was done when the bulb was brand new. I can’t guarantee that they will perform similarly after months or years of use.

Edited by: maukka on 02/13/2020 - 09:20
SunLike
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WTF is this?! Shocked Where did you get that?! Big Smile

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Manufacturer of this awesome LEDs is SmartEcoLightning co.

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Almost new. I use it about 2-3 weeks. Testing of ceramic 50v 100uf x7r huge capacitors. It is the reason why there is no high frequency pulses.

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And it is cheap version. I mean that there is 6w led. About 89% effectiveness of LED driver. And there is some higher of middle (6w) power of the LED. But I compensated it by 1.2mm 26×26mm copper board. (next version will be 30×30×1.5mm)

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If someone want more photos in Telegram

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Previous version of LED’s driver upgrade

- Changed 105° capacitor to CBB (v.1.3 to 130° Rubycon RX30), there is anought space to 4.7+4.0 uf CBB
- added 100v 3.3-4.7uf CBB OR 50v 100uf x7r ceramic capacitor (in black body)
- added suppressor 1.5 350CA
- added NTC resistor 33D-7
- added reusable fuse JK250 145mA (in 9w model)
- Changed current to 9w from line

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qandeel
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I tried to order 6 bulbs but when I registered in the site and reached the payment section I could not find PayPal as an option. Is it possible to use PayPal? Many thanks.

 عُمَانْ

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qandeel wrote:
I tried to order 6 bulbs but when I registered in the site and reached the payment section I could not find PayPal as an option. Is it possible to use PayPal? Many thanks.

I must send bill to you manually. I will do it soon.

upd.

But you must place order. You just registered. Place order please

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qandeel
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SunLike wrote:

I must send bill to you manually. I will do it soon.

upd.

But you must place order. You just registered. Place order please

Order placed

 عُمَانْ

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I think I already know the answers in this case but for future reviews I would also include some other info:

Dimmable: yes/no (if yes to what %)

Rated for enclosed/wet?

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12W+ models are dimmable. Also it is with D index. For exemple SunLike12 D

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Those are fair requests. As you probably guessed, dimming with your traditional leading/trailing edge dimmer isn’t going to work well on this since the current is drawn in such short pulses. This is not suitable for wet environments as the driver is visible from the outside of the bulb.

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Since the diffuser is threaded I bet in some scenarios with frosted fixtures you could leave it off entirely if length was an issue. Not sure how even it would look though but might be fun to try.

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That’s totally feasible if you’re already using a diffusing light fixture or bounce the light off the ceiling.