HP LP2475W Review

The HP LP2475W is superb 24” monitor for photography under £400. Thanks to its W-CCFL backlighting the HP LP2475W is able to produce an extremely wide colour gamut, covering 92% of the NTSC colour range.

The HP LP2475W 8-bit H-IPS panel can produce 16.7million colours and at 24” this monitor provides a good amount of work space. The aspect ratio of 16:10 and 1920 x 1200 resolution means the HP LP2475W is good for HD movies too.

Unlike the Asus PA238Q the HP LP2475W performs disappointingly out of the box in terms of colour reproduction. However, equipped with a colorimeter and relevant software you can calibrate the HP LP2475W to be one of the most colour-accurate monitors out there.

• 1920×1200 (16:10 aspect ratio) full HD resolution
• 1000:1 static contrast ratio
• 400 cd/m2 brightness
• DVI-I, HDMI, DisplayPort, Component video, S-video, Composite, USB 2.0 Hub: self-powered, six ports
• 8-bit colour depth

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The HP LP2475W is quite a good looking monitor with its thin matte black bezel and silver base. The stand is sturdy but the base does take up quite a bit of desk space. It is, of course, equipped with the full array of adjustable features. The height can be adjusted by 11.5cm and the HP LP2475W can be tilted and swivelled by 35° and 45° respectively. The HP LP2475W can also be rotated into portrait mode thus providing all the versatility a photographer could want in a monitor.

The HP LP2475W offers a whole host of connection options, including 6 USB ports, and the cables to go with them. The only omission is a VGA port but a DVI to VGA cable is provided along with cables for DVI-D, HDMI, DisplayPort, USB and the power cable, naturally.

The 24” screen on the HP LP2475W provides a large workspace and the resolution and aspect ratio make it a good size for running two computers simultaneously.
The HP LP2475W monitor also has an anti-glare coating to remove reflections without affecting the image.

The 8-bit H-IPS panel can produce 16.7million colours without resorting to colour simulation techniques. Screens with 10-bit colour are becoming more readily available now but they are really only necessary for the professional photographer. If you’re an amateur, or even a professional for that matter, you may only get 8-bit colour out of such screens anyway, depending on what camera, software and printer you are using. A monitor with 8-bit colour is suitable for all but the most demanding colour work.

Thanks to the advanced W-CCFL backlighting the HP LP2475W has a very wide colour gamut. The HP LP2475W covers 92% of the NTSC colour space which is about 40% bigger than the sRGB space. While wide colour gamuts are desirable, you will need to adjust the monitor’s settings if you are working in the more common sRGB space.

All this makes for an attractive picture on paper but a good monitor for photography needs to display these colours accurately as well.

Unfortunately one thing the HP LP2475W doesn’t offer out of the box is a high level of factory calibration. The Asus PA238Q, on the other hand, comes with guaranteed colour accuracy with is great for the amateur photography enthusiast who may not have the software and hardware necessary to properly calibrate a monitor.

The default settings of the HP LP2475W are too bright and luminance was measured at near maximum brightness (357 cd/m2). The colour temperature was out by around 15% but the gamma was pretty good being only 2% off the 2.2 ideal when measured without adjustment.

Colour accuracy at the default settings is also poor and is certainly not suitable for work with photography. The average Delta-E was recorded at 4.5 which is a colour variation easily perceptible to the eye which can detect colour differences of 3 and above. A Delta-E of less than 2 is considered suitable for colour critical work, though there is still a small imperceptible colour difference. Anything below 1 is almost perfect. The HP LP2475W even scored a maximum Delta-E of 11.1!

The HP LP2475W does have a great black depth on the default settings though and the contrast of the screen remains pretty constant over varying levels of brightness. In fact the black depth got down to 0.45 cd/m2 at minimum brightness, a very good score for an IPS panel.

Even so, without calibration the HP LP2475W just isn’t a photographer’s monitor.

But properly calibrated things look very different. Luminance levels are reduced, the colour temperature is much more accurate and gamma is spot on. The black depth was further improved to 0.17 cd/m2 from 0.45 cd/m2 meaning that all but the darkest greys are distinguishable from black.

Colour accuracy improves vastly after calibration scoring some phenomenal results with the average Delta-E 0.3, a score highly desirable in monitors used for colour work.

Luminance uniformity across the screen has also been measured to be very good. Differences in luminance will change how the colour on that part of the screen is displayed. Large variations result in inaccurate colours. Uniformity does depend on several contingent factors and so varies from unit to unit but the scores of the tested HP LP2475W are reassuring. Generally there wasn’t a variation of more than 5% in luminance though the lower right hand corner did vary significantly more, to about 20%, but this was only minor and certainly not a deal breaker.

The only other negative that’s been reported about this monitor is a slight hum when the brightness is reduced. This doesn’t seem to be a universal problem though.

The HP LP2475W is a good all round monitor and is perfectly suitable for games and movies. The impressive black depth means dark scenes look fantastic on this monitor despite the IPS panel. The large screen and high resolution is great for HD movies but it can highlight flaws in the image, especially when scaled up from SD content.

The grey to grey response time of 6ms coupled with the very low input lag mean most gamers will also be happy with the HP LP2475W monitor.

The HP LP2475W is a fantastic inexpensive monitor for photography. You will need to calibrate it to achieve the desired results but once you do you’ll have a much better performing monitor than even the best factory calibrated ones.

Pros

• Superb colour accuracy after calibration
• Very wide colour gamut
• 24-bit colour depth
• One of the best black depths of any IPS monitor
• Great connectivity and accessories supplied

Cons

• Calibration is definitely needed, you will need the relevant kit
• Not a great monitor for viewing films close up
• Quiet “hums” have been reported

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Specifications

• Display size (diagonal): 61 cm (24″)
• Aspect ratio: Widescreen (16:10)
• Resolution: 1920 x 1200
• Display pixel: 0.270 mm
• Brightness: 400 cd/m2
• Contrast ratio: 1000:1
• View angle: 178° horizontal, 178° vertical
• Response time: 6 ms (gray to gray); 12 ms (on/off)
• Product colour: Carbonite
• Tilt and swivel angle: Tilt range: -5° to + 30° vertical tilt, swivel range: -45° to +45°, height adjust: 100 mm, pivot rotation
• Display features: Anti-glare and anti-static coatings
• Physical security: Kensington Lock-ready

Connectivity

• Input signal: 1 DVI-I, 1 HDMI, 1 DisplayPort, 1 Component video, 1 S-video, 1 Composite
• Ports: USB 2.0 Hub: self-powered, six ports (cable included)

Dimensions and weight

• Weight: 9.1 kg
• Dimensions (W x D x H): 55.6 x 8.3 x 36.2 cm
• Product dimensions with stand (W x D x H): 55.64 x 25.3 x 42.16 cm

Power and operating requirements

• Power: 100 to 240 VAC, 50 to 60 Hz
• Power consumption: 120 watts maximum, 75 watts typical
• Operating temperature range: 5 to 35° C
• Operating humidity range: 20 to 80% RH

What’s included

• Warranty: Limited 3 years parts, labour and on-site service, including backlight. Availability varies by region. Certain restrictions and exclusions apply. For details, contact HP Customer Support or Service
• What’s in the box: DVI-I to VGA cable, DVI-D, HDMI, DisplayPort, USB cable, power cable

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