Many secondary sources have, as father of these children, one or the other of these two immigrants:

Johann Pieter LICHT, a.k.a., John Peter LIGHT
Birth:  1815/6, Europe
Migration:  arrived (age 21) on 30 Aug 1737 in Philadelphia on the ship Samuel, out of Rotterdam
But note that he is too young to be the father of any but the youngest of these children (viz., Henry).

Johannes LICHT, a.k.a., John LIGHT
Birth:  1681/2, Europe
Migration:  arrived (age 56) on 5 Sep 1738 in Philadelphia on the ship Winter Galley, out of Rotterdam
But note that if his wife is also in her 50s, she is too old to be the mother of any except possibly the eldest of these children.  Note also that there were no other adult (age 16 or over) LICHT males on the list.  We would expect a couple in their 50s to have several sons over 16.

— born in Germany:
1.  Johannes LICHT, b. 21 Feb 1726; m. Anna LANDIS 
2.  Martin LIGHT, b. 26 Dec 1726; d. 26 Aug 1805
3.  Anna LIGHT, b. 4 May 1728; d. 1792
4.  Jacob LIGHT, b. 7 Aug 1730; d. 24 Apr 1788; m. Elizabeth LANDIS 
5.  Barbara LIGHT, b. ca. 1735; d. aft. 1759

— born in PA:
6.  Henry LIGHT, b. 7 Mar 1738; m. Barbara LANDIS 

Because these three LICHT males married three LANDIS sisters, it has been assumed they are brothers — definitely a fair assumption.  But are they?  If they are, indeed, brothers, then it seems impossible that either of the above immigrants is their father, unless Johannes had a second, younger wife, in which case then, of the two, only he could be their father.  But…

A further complication is an 1886 biographical sketch of Henry S. LIGHT (1856-1899), in which he gives this ancestry:
John Peter LIGHT, immigrant to PA in 1737
_Henry LIGHT (I)
__Henry LIGHT (II)
___Martin LIGHT
_____John O. LIGHT (1812-1901)
______Henry S. LIGHT (1856-1899)
which is possible only if Henry (I) is not the brother of Johannes and Jacob, that is, not the husband of Barbara LANDIS, which he is said to be.

1.  William Henry Egle, ed.  1890.  Names of Foreigners Who Took the Oath of Allegiance to the Province and State of Pennsylvania, 1727-1775, with the Foreign Arrivals, 1786-1808.  Pennsylvania Archives, Vol. XVII, Second Series, Harrisburg, PA (reprinted 1967ff by Genealogical Publ Co., Baltimore, MD; in 2000 as Broderbund CD-512):

p. 131	LIST OF FOREIGNERS IMPORTED IN THE SHIP SAMUEL, HUGH PERCY, MASTER, FROM ROTTERDAM. QUALIFIED AUG. 30, 1737... Johann Peter Licht...
p. 134	Peter Leight [age] 21...
p. 146	LIST OF FOREIGNERS IMPORTED IN THE SHIP WINTER GALLEY, EDWARD PAYNTER, MASTER, FROM ROTTERDAM. QUALIFIED SEPT. 5, 1738... Johannes Light...
p. 148	Hannis Light [age] 56...

In each case, there are two lists of the same passengers, the second one including their age.  As is the usual the case, males under 16 and females are not listed.

2.  Anon.  1886.  Portrait and Biographical Album of Ogle County, Illinois.  Chapman Bros., Chicago.

Henry S. Light.  One of the prominent, as well as successful, farmers of Leaf River Township, is the gentleman whose name heads this biographical notice.  He was born in what was known as Lightsville, this county, March 17, 1856, his father being John Light, one of the old pioneers of the county and founder of the village of Lightsville.  He was born in Lebanon Co., Pa., July 17, 1812. The first known ancestor of the Light family to locate in the United States was John Peter Light, a native of Germany, who came to this country in 1737, locating in Lancaster Co., Pa.  We trace the genealogy of our subject from this ancestor as follows:  Martin Light, grandfather of the subject of this notice, was the son of Henry, who was the son of Henry, and who in turn was the son of John Peter Light...

3.  Moses Light.  1896.  The Light Genealogy in America.  Self-published, Manheim, Lancaster Co., PA (facsimile online at the Light Family web site [link died]).  This book is said to contain substantial errors.

4.  The Light Family web site [link died].

5.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).