Celestial Challenge:
Celestial challenge is great challenge initiated by great 
This contest is great and in this contest people have to post according to different themes defined by days!
According to today's day which is Sunday the theme of today is Light!
So my complete post will be on light!
Normal Headlight:
People who drives or ride are familiar with headlight!
Headlight is an thing which is used to produce light throw on the road, it consists of a bulb in it for the light source!
Headlight bulb are usually like these:
And the normal light which used these types of bulb are like these:
(CAR FRONT PIC
IF someone is using these light, they give usually a good through but there flow is not in the right direction most of the time! As if someone is using high beam the through of the light become very high but it directly goes toward the screen of the other car coming from other sides which causes accident many times as the driver coming from the front side can't focus due to these light! Huge amount of people are still using these light which is really dangerous! People who are using these light should always keep there beam low for the other driver!
For example you can see the effect in the picture and think that its just a picture and what effect it causes at real times!
Projection Headlights:
Projection headlight are the new version of headlight using majorly and there popularity is raising day by day which is good! Theses headlights are not just normal head light as in there name word "Projection" is there because these light project lights on the road not on some other face or upwards!
They are really good in quality and there projection is so good that they have been proven good as compare to old headlights! These light consists of little circular type glass init which prevent through of light to get toward upside! And they are also proven that they gave more wide through of light as compare to other headlights!!
These are some projection headlamps & there through!
Now if someone wants to participate and know about @Sirnight, do have a visit to his blog & his daily themes for celestial challenge are:
Sunday : Light
Monday : Darkness
Tuesday : AnimalKingdom
Wednesday : Structures
Thursday : ForcesinNature
Friday : LoveBeautyFreedom
Saturday : Agriculture