can you mount this projector to a ceiling?

Yes. You can use the Dell Part #310-4725 or almost any universal mount. A simple Google search for Dell M900HD Ceiling Mount produces many hits.

Could you please indicate the LED Lamp lifetime? Also please provide the light cost.

Hello. I only bought this item on Feb 02 and have limited use with it so far. So, I am unable to answer your questions. Have you thought about contacting Dell directly to ask them?

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Dell M900HD 1280 x 800 WXGA 900 Lumens Wireless Display (WiDi) & Miracast Features, Portable LED Projector

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1280 x 800
900 ANSI Lumens (Max.)
10000 (700:1)
30" to 80"

Overview

Specs

Reviews (3)

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Model
Brand	Dell
Model	M900HD

Details
Cabinet Color	Black
Type	LED

Display
Brightness	900 ANSI Lumens (Max.)
Native Resolution	1280 x 800
Contrast Ratio	10000 (700:1)
Display Size	30" to 80"

Lens
Lens	Fixed Lens (Digital Zoom only)
f Number	1.5
Throw Ratio	1.4 (wide and tele)
Throw Distance	2.98 ft ~ 7.87 ft (0.91m ~ 2.4m)

Lamps & Accessories
Lamp	Mercury-free LED light source
Lamp Life	Up to 30,000 hours in Normal Mode

Connectivity
Input Video Compatibility	Digital
Input Video Connectors	HDMI
Output Audio Connectors	3.5mm stereo mini phone jack
USB	Yes
Other Connectors	WiFi, intel WiDi3.5 with Miracast

Convenience
Built-in Speakers	Yes
Features	Built-in 2 GB Flash Memory Extensive connectivity: Connect your laptop, tablet or mobile device using a full range of wireless and wired options. Highly portable: Easily carry your projector between locations with a lightweight, low-profile design and an included carrying case. Bright projection: Give your presentations the impact and clarity they deserve with a powerful 900-lumen LED light source.

Power
Power Supply	100 - 240 VAC, 50/60Hz
Power Consumption	142W +/- 10% Normal Mode 106W +/- 10% Eco-Mode not more than 0.5W (fan speed at minimum) Power-Saving Mode not more than 0.5W Standby Mode

Environmental
Noise Level	36 dB(A) Full-On Mode Typ. 38 dB(A) Full-On Mode Max. 34 dB(A) Eco-Mode Typ. 36 dB(A) Eco-Mode Max.

Dimensions & Weight
Dimensions (H x W x D)	9.13" x 6.46" x 1.69" (W x D x H)
Weight	3.5 lbs.

Package Contents
Package Contents	Dell M900HD projector Power cord USB A-A cable Carrying Case Sleeve Cover Remote control and battery User's Guide (CD / HTML format) Quick Setup Guide Product Information Guide NOM Tech Sheet

Additional Information
First Listed on Newegg	September 30, 2013

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return Policies

Return for refund within: Non-refundable

Return for replacement within: 30 days

This item is covered by Newegg.com's Replacement Only Return Policy.
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Dell M900HD 1280 x 800 WXGA 900 Lumens Wireless Display (WiDi) & Miracast Features, Portable LED Projector

Learn more about the DELL M900HD

Customer Reviews of the DELL M900HD

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16824260159

Dell M900HD 1280 x 800 WXGA 900 Lumens Wireless Display (WiDi) & Miracast Features, Portable LED Projector

Learn more about the DELL M900HD

Customer Reviews of the DELL M900HD

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info