beeCam Light Meter is a incident-light meter application.
This app can measure the exposure without influence of the reflectivity of subject.
The accuracy of measurements depends on the sensor of your phone.
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This app can also calculate f-stop or shutter speed by using manually inputted illuminance or EV.

The following model is a model that CAN retrieve the value of illuminance sensor confirmed by the user's review.
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Nexus S Nexus One REGZA Phone IS04
HTC EVOHTC WILDFIRE Motorola Droid 2 Global
Motorola DEFY DROID X DROID BIONIC
Samsung Galaxy S2(SC-02C) Samsung Galaxy_Tab(SC-01C)
LYNX 3D SH-03C Dell Streak Garmin A50
DELL Streak SoftBank 001DL MEDIAS N-04CSHARP IS03
AQUOS PHONE SH-12C AQUOS PHONE IS11SH
iida INFOBAR A01G'zOne(IS11CA)
Acer Liquid Metal REGZA Phone T-01C
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The following model is a model that CAN NOT retrieve the value of illuminance sensor confirmed by the user's review.
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HTC Legend HTC Desire HTC EVO 3D HTC hero
Samsung Galaxy S Samsung Galaxy S2(?)
Samsung Galaxy Ace T-Mobile G2x
Motorola Milestone Motorola Milestone2
Motorola CLIQ Motorola ATRIX(Gingerbread Version)
Motorola DROID X(?) DROID 2(?) Xperia acro Xperia Arc
Xperia SO-01B S51SE myTouch slide Optimuschat L-04C
Sony Ericsson ST18i SHARP IS01 LG P500 LG Optimus Dual
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Please see instructions here!
http://www.fmbee.com/products/beecamlightmeter_en.html

Measurement procedure
(1) The application program is started.
(2) From the screen tap the "START" button.
(3) Smartphone put in front of the subject.
(Please toward for the camera side where the illuminance sensor is used to take a picture. )
(4) Tap the "STOP" button.
(5) When the ISO sensitivity is set tap the "ISO" button .
　　 The ISO setting screen is displayed.
Please select the ISO sensitivity.
(6)
[For aperture priority]
To calculate the shutter speed tap the "F" button.
　 A set screen of F value is displayed. Please select F value.
[For shutter speed priority]
To calculate F value the "T" button is pushed.
A set screen of the shutter speed is displayed.
Please select the shutter speed.
(7) From the screen get　The ISO F value and the shutter speed and set in the camera.

Remarks
ï½¥The illuminance sensor is installed on the liquid crystal screen side of the terminal.
ï½¥In the terminal that cannot use the illuminance sensor the "INPUT" button is displayed instead of the "START" button.
Tap the "INPUT" button the illuminance setting screen is displayed.
Please specify the illuminance corresponding to the situation.
The ISO F value and the shutter speed are calculated by the specified illuminance.
ï½¥When click the menu key to the termina the menu is displayed under the screen.
In "Setting" menu it is possible to set it as follows.
Select light values:
Select useing sensor or manual input.
Sensor correction:
Input the correction value of the illuminance sensor.
Steps:
Select same the steps as the camera used to take a picture.
ï½¥The light sensor may not get the terminal does not change the brightness and intensity.
In that case please read after covering with the hand and darkening the sensor once and apply light.
ï½¥The light sensors may take some time to get light.