Review: DIY LED U-Home E27 COB spot bulbs (4000K, 5000K, CRI95)

I bought a 4000K and 5000K CRI95 E27 LED spot bulbs from DIY LED U-Home on Aliexpress.
Store link:

The main specs by the manufacturer:
-CRI (Ra) 95
-Undisclosed COB emitters
–650-700 lumens
–7W power draw
-Wide AC voltage range of 85-265V
-Available in 3000K, 4000K, 5000K and 6000K (4000K and 5000K tested here)
–45-60° beam angle
-No dimming
-No lifetime specified
-Unknown warranty

Overall finish and build quality seems good. The aluminum heatsink is painted white and it doesn’t take much to scratch it off. I don’t like that you can hear the AC-DC converter rattling around in the base when the light is shaken though.

The spotlight compared to a 60W incandescent.

The bulb has a plastic lens protecting the COB LED and reflector. Wide and even spot is achieved with a textured reflector. There very little visible tint shift in the beam. Only very faint artifacts can be seen on a white wall at the edge of the beam.

When you put a table lamp shade on it the artifacts disappeared. I used an Ikea Tertial work table arm.


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

The bulbs were connected to mains power which at the time of testing was at 228-230V.

Output at 1 hour is 574 for the 4000K and 593 lumens for the 5000K model. This is less than the manufacturer specifies (650-700 lm). At 0.6 cd/lm the spot bulb is noticeably throwier than a diffused bulb (0.1-0.2 cd/lm)

Power consumption was measured at 7.1 (4000K) and 7.4 watts (5000K). Efficiency is quite low for a high CRI neutral/cool white AC bulb at only 80-81 lm/W. Yuji BC bulbs achieve 104-109 lm/W at similar color temperatures, but they also cost twice as much.

Maximum output is reached immediately. Output was plotted over one hour on both lights. After 1 hour the output decreases 11%, which is a fine result for such a small bulb. Heatsinking seems good.

Color rendering

The CRI data was measured integrated after a 1 hour warm-up.

Color rendering is very good on both bulbs reaching CRI Ra of 98 and R9 of 92-93. TM-30-18 fidelity index Rf of 94-95 and gamut index Rg of 99-100 are also excellent. Typical LED technology is evident from the blue hump at 450nm and cyan dip at 480nm, but the latter is very mild. Visually the light is very pleasing with rich colors and neutral tint.

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

CGATS CRI Data files:

Color temperature and tint

Tint is practically at the black body line on both bulbs. Remember that when LEDs heat up, their duv value almost always decreases and becomes less green/yellow. This was measured after 1 hour.

Tint shift was measured with the 5000K LED after a 5 minute warm-up period. Shift is very slight within the brightest part of the beam which falls off quickly after 55 degrees or so. The shifted tints in the following chart at 60+ degrees are already outside the bright spot.


There’s no visible flicker. Just small ripple at 56kHz. Snob index of 0% guarantees that it’s easy on the eyes. The modulation depth was highest when all the LEDs were active, which as the worst case is shown below. Both lamps are identical in this matter.

AC power draw

Current is drawn in short pulses as the input voltage gets high. This results in a low power factor of 0.56-0.57.

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


These little E27 spotlights at 4000K and 5000K have a pleasing tint and good color rendering. They offer quite a bit more lux at a smaller area than diffused bulbs. The efficiency is not at the level of competition, but that’s quite ok for the price assuming the driver ages well. In packets of five they cost less than $9 a piece.

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.

aluminum body-heatsink - it is good =)

But your reviews is not exhaustive without autopsy

s. Beautiful body. But I would load it with a maximum of 5 watts with 6W SOL LED (for example)

I’ll leave the driver and component analysis to someone who knows what they are talking about.

at least just measure the actual capacitance and ESR of the capacitors. If you take a few photos, experts from this forum will comment on everything instead of you.

About spectrum. Without violet and with not big blue peak. almost good

Dear maukka,

Thank for your professional testing and reviews, about the efficiency, we will report to our factory.

We have already uploaded your testing report to our aliexpress store, let more and more people to know our this problem and your this thread.

About the lifetime specified and warranty,

The lifetime of driver is normal 2 years.

About the warranty, please don't worry, we support lifetime warranty, if it's broken when used, we support to resend new one to our custom as compensation.

Best regards,


Hi maukka,

Maybe you can also try our this new led bulb, it's also 95+ daylight white 11W E27 bulbs,

here is the link:

@ DIY LED U-HOME, do you think it would be possible to make a version optimized for non-daylight use, along with an integrated diffuser?

Would be great to replace 3 LEDs with one singular large LED, but at 5500k and exposed LEDs, it is a bit… extreme.

Dear BlueSwordM,

Yes, you are right, different product has its different use at different places.

So suggest customers to buy our high CRI led products according their practical necessity.

Best regards,


Please also include a link to this review on the store page:

Dear maukka,

Sorry, according ebay and aliexpress website policy, the http link will be removed at listing page when we add the link at our store, we tried to include a link to this review on the store page yesterday. Please don't worry, we have already copy your all reviews including pictures of this link at our listing page, you can take a look.

Best regards,


Aliexpress 3.28 10th Anniversary Starts on March 27th AM PT,here is the link:

You might consider selling the sex toys at a different store than your LED strips/bulbs.

Thank you for this review. I bought 3pcs 4000K version (7,64€ / bulb). Awesome value for money for a CRI 98 and flicker free bulb!

You can also make this insanely bright with a E27 splitter adapter.

the sex toys is FBA shippment at USA warehouse, hope you understand.

Thank you for your purchase our this high CRI RA spotlight,

Welcome to buy more at our store next time again.

Best regards,


Season sale at our aliexpress store Starts on Aug 23, 12:00 AM PT, is coming soon at our store.

We want to tell everyone that we have already listed our new product, SMD3030 LED Panel Light as below pictures at our aliexpress store just now, here is the link:

Amazon store:

Ebay store:

Here is the link of 300*195mm Grille Shape Aluminum Heatsink Heat Sink Radiator Cooling Fin for our SMD3030 LED Panel Light LED Plant Grow Light PCB Boards,

if you are interested in this led panel light, welcome to buy one at our stores.

Warm White 2800K-3200K Testing Report from Factory

Daylight White 5500K-6000K Testing Report from Factory

You might like this also!

you also can use our led strip light or spotlight to DIY this kitchen lights.

Black Friday Fest will begin on Nov 25th,

Here is the link of this New product at our aliexpress store, Black Case High CRI Ra 95+ 7W E27 LED Bulbs is arrival,

ebay store: