Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM – Test and Review

Lepa BOL.QUIET is the latest series introduced in the company portfolio offering 3 brand new 120mm fans made just to provide the best possible airflow / noise level / life span performance. The series itself offers:

  1. BOL.QUIET Tri-Speed – a 120 x 25 mm fan offering 3 speed modes; in fact they are 3-pin powered and regulated with MTBF up to 160,000 hours
  2. BOL.QUIET PWM –  a 120 x 25 mm fan offering a single mode operating in 600 ~ 1600 revolutions per minute range,  4-pin PWM powered and regulated with MTBF up to 160,000 hours

For this test and review I received all 3 models and I am very excited to check how they will perform and what they have to offer to me and all possible owners of the products worldwide.

As usual, first things first, so let’s check the structure of the fans and after that check their performance.

IMG_9793

All 3 new models from Lepa BOL.QUIET series arrived to me in absolutely identical packages, made of a carton box painted in the black/yellow/brown colour scheme. All of the boxes are made with a front flap, covering a see through cut, through which you can see the shape of the propellers and the colour backlight for the Lepa BOL.QUIET PWM models.

On the front side of the front flap cover there is a big picture of the fans with some additional features described, such as the fan size, the powering and regulation method and of course the colour of the backlight for Lepa BOL.QUIET PWM. On the inner side of the front flap there is a lot of information describing the main features of the products such as the frame and the propeller structure and most of all the pathented BOL bearing.

Of course, the full technical specifications regarding the products are described on the back of the packages with some additional information regarding the products in several languages.

 Lepa BOL.QUIET Tri-Speed Lepa BOL.QUIET PWM Blue   Lepa BOL.QUIET PWM Red
IMG_9795 IMG_9805 IMG_9814

 

So I believe I should start reviewing the products and here I want to say that actually all of them are using identical frame and propeller structure but Lepa BOL.QUIET Tri-Speed offers a bit different features regarding the fan operation.

 

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM STRUCTURE

Lepa BOL.QUIET Tri-Speed Lepa BOL.QUIET PWM Blue  Lepa BOL.QUIET PWM Red
IMG_9796 IMG_9807 IMG_9816

 

All 3 models, like any other fan on the market, are made of 3 major components designed to provide the best possible cooling performance, while working at very low noise levels.

–  LEPA modular 120 x 25mm, entirely painted in black square frame, made to be installed on a 120mm case fan slot or on a CPU cooler compatible with 120mm or 140mm fans, featuring the LEPA logo halo ring design made for overall increase of the airflow by allowing additional air to get inside the air stream from all sides of the frame. The frame itself offers very futuristic design, with a lot of sharp edges to improve the overall appearance of the product.

IMG_9800

Apart from that, the Lepa BOL.QUIET PWM models feature 4 blue or 4 red LEDs installed on each corner of the frames offering a very nice and steady blue or red back light.

– Lepa BOL.QUIET models are equipped with a semi transparent propeller featuring 7 very wide and at the same time very sharply angled blades with the S-blade with winglet design made to improve the overall cooling efficiency by minimizing the turbulence and stabilizing the airflow which is passing through the propeller. Apart from that the propeller itself is made to be detachable with just one purpose and that is for convenient dust cleaning.

– Lepa Patented BOL (Barometric Oilless) bearing offers a self-lubricating design using nano materials, which are used for high working temperature environment providing MTBF up to 160,000 hours life span. The bearing itself features minimal friction operation and therefore it is quieter than traditional 2 ball-bearing.

 Lepa BOL.QUIET Tri-Speed Lepa BOL.QUIET PWM Blue   Lepa BOL.QUIET PWM Red
IMG_9799 IMG_9808 IMG_9818

 

All 3 fans are made with almost identical structure but with totally different operation, back light and powering and regulating methods.

– Lepa BOL.QUIET Tri-Speed – the fan itself doesn’t offer a back light and it is equipped with a pretty long, unfortunately not sleeved in black mesh 3-pin power and regulation cable offering 3 different operation modes done with additional voltage adapters, which are provided in the package:

  1. Performance mode: the fan works at 1600 ±10% revolutions per minute, providing airflow level of 138.39 m3/h, static pressure level of 1.923 mm-H2O with minimal noise level of 18 dBa.
  2. Silence mode: the fan works at 1100 ±10% revolutions per minute, providing airflow level of 95.24 m3/h, static pressure level of 1.397 mm-H2O with minimal noise level of 12 dBa.
  3. Ultra silence mode: the fan works at 800 ±10% revolutions per minute, providing airflow level of 69.18 m3/h, static pressure level of 0.829 mm-H2O with minimal noise level of 8 dBa.

– Lepa BOL.QUIET PWM Blue / Red – the fans offer blue and red back light and are equipped with a pretty long, entirely sleeved in black mesh 4-pin PWM power and regulation cable offering just one mode which works in 600 ~ 1600 revolutions per minute range, providing airflow level range of 52.01 ~ 138.39 m3/h, static level range of 0.538 ~ 1.923 mm-H2O with noise level range of 8 ~ 18 dBA.

According to the official information, provided by Lepa I think that all 3 fans use absolutely identical motor with only one difference and that is in the powering and regulating method. Lepa BOL.QUIET PWM is equipped with 4-pin PWM cable, while Lepa BOL.QUIET Tri-Speed is equipped with 3-pin cable and the regulation is done with additional adapters provided in the package.

And by mentioning the additional accessories, let’s check what accessories all 3 fans are equipped with.

 

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM ACCESSORIES

  Lepa BOL.QUIET Tri-Speed Lepa BOL.QUIET PWM Blue  Lepa BOL.QUIET PWM Red
IMG_9802 IMG_9812 IMG_9819

 

All 3 fans are accompanied by absolutely identical basic accessories pack featuring:

  1. A set of 4 rubber pins for installing the fans on a 120mm case fan slot
  2. 3-pin power adapter for powering the fans directly from the power supply

Lepa BOL.QUIET Tri-Speed accessory pack features 2 additional voltage adapters:

  1. Only for Lepa BOL.QUIET Tri-Speed – 1 x 7V adapter for reducing the power voltage
  2. Only for Lepa BOL.QUIET Tri-Speed – 1 x 5V adapter for reducing the power voltage

I believe the time has arrived to install the three fans on my test stand and check out how they will perform,

 

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM TESTS

Before I do the tests I want to say that for Lepa BOL.QUIET Tri-Speed I won’t use the additional adapters.

The tests will be conducted in my standard way. I will install the fans and test them at 5V/7V/9V/12V and my goal will be to check the performance of the products in real conditions. They will be tested under close-to-perfect conditions, not taking into account any external factors. The results achieved during the test can in no way be the same if the models are mounted on a cooler or on the case fan slot of any modern computer case. I will measure the amount of air going through the fans for one hour and their speed. For this I use a fan controller, a voltage meter, an anemometer and a stand made specifically for this purpose.

And this is what the fans look like installed on my test stand:

IMG_9822

The test results are shown in the following charts:

Airflow through the fans at 5V, 7V, 9V, 12V

 

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM A

Propeller rpm during the tests at 5V, 7V, 9V, 12V.

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM R

The anemometer showed the following air speed passing through the propellers:

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM S

After mounting the fans onto the stand, and leaving them to rotate for about 60 minutes at maximum speed, it was time for the tests to begin.

As with my other tests, again I started with a gradual increase of the voltage through the Lamptron FCT starting at 0V and Lepa BOL.QUIET Tri-Speed made at least one stable revolution at about 4.5V, while the Lepa BOL.QUIET PWM models started rotating at 7V. Apart from that the back light for the Lepa BOL.QUIET PWM started blinking at about 3.5V. Of course, to do the tests for all 3 fans I had to set a starting voltage of 5V.

Test at 5V:

At the first test conducted at exactly 5V, Lepa BOL.QUIET Tri-Speed was rotating at 840 revolutions per minute, providing stable airflow of 49.92 cubic metres per hour, while Lepa BOL.QUIET PWM models were not rotating at all and they were not providing any airflow at all. At this test Lepa BOL.QUIET Tri-Speed was absolutely quiet.

Test at 7V:

At the second test conducted at exactly 7V, Lepa BOL.QUIET Tri-Speed was rotating at 1140 revolutions per minute, providing stable airflow of 69.12 cubic metres per hour, while Lepa BOL.QUIET PWM models were providing absolutely identical airflow level of 14.4 cubic metres per hour at only 420 revolutions per minute. Again all 3 models were absolutely quiet.

Test at 9V:

At the third test conducted at 9V, Lepa BOL.QUIET Tri-Speed was rotating at 1365 revolutions per minute, providing stable airflow of 84.96 cubic metres per hour, while Lepa BOL.QUIET PWM models were providing absolutely identical airflow level of 72.96 cubic metres per hour at 1230 revolutions per minute. At this test all 3 fans started generating a tiny noise coming from the air passing through the propellers.

Test at 12V:

At the last test conducted at 12V, all fans reached their maximum performance, which for Lepa BOL.QUIET Tri-Speed it was 106.56 cubic metres per hour, while rotating at 1710 revolutions per minute, while Lepa BOL.QUIET PWM Blue was rotating at 1725 revolutions per minute providing airflow level of 105.84 cubic metres per hour and Lepa BOL.QUIET PWM Red was rotating at 1680 revolutions per minute providing airflow level of 103.68 cubic metres per hour. At the last test all 3 models were a bit noisy, which was to be expected with those revolutions per minute and providing that airflow level.

 

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM CONCLUSIONS

1. Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM Performance:

After I spent a few hours reviewing and later testing the fans, I should say that I am pretty excited about the overall cooling capabilities, the noise level and the appearance of the 3 new models, part of the Lepa BOL.QUIET series.

According to my experience with the products I can recommend them to be used as case fans for boosting the overall airflow, and at the same time to keep the noise level at low or average level inside every modern case and keep all of the hardware installed inside the case running cool and quiet.

Apart from that all of them can be a pretty good choice to be used with a 120mm or 140mm compatible coolers installed on a processor working at default or just a little bit overclocked processors. Unfortunatelly, I don’t think they will be able to keep cool a heat sink installed on a very highly or extremely highly overclocked processor, because after all they are made to provide the best possible airflow/noise/appearance balance and as we all know it is not possible to have high performing fan running at low noise level. It is just not possible.

 

2. Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM Appearance:

All 3 new fans offer absolutely identical frame and propeller structure, made entirely to provide a pretty serious performance boost and at the same time amazing overall appearance for any modern case featuring an entirely painted in black interior. Apart from that the Lepa BOL.QUIET PWM are equipped with a very stylish looking additional blue or red backlight which can add a very nice stroke to the overall visual effect when combined with hardware using blue or red colour scheme.

I think Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM deserve the following reward:

Best-Visual-silence

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM  have been added to the 120mm fans catalogue.

Official price (MSRP): Lepa BOL.QUIET Tri-Speed e:  7.99 eur including VAT

Official price (MSRP): Lepa BOL.QUIET PWM :  9.99 eur including VAT

Warranty: 24 months

I thank Lepa for the test samples.

LEPA logo cis-20130201-轉

Lepa BOL.QUIET Tri-Speed and Lepa BOL.QUIET PWM – Test and Review
8 Total Score
Amazing appearance combined with very good performance while working at low noise level

Performance
8
Noise Level
9
Additional accessories
9
Appearance
10
User Rating: 3.51 (13 votes)

Dobrin Krastev is the owner, reviewer and newsman of www.DVTests.com with more than 15 years' experience in personal computers, server and storage systems, UPS, peripheral devices and software. Passionate about testing and reviewing, AMD overclocking using AM3 990FXA and AMD FM2 A85X test systems and building modding projects.
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