Applying conditional format to INDIRECT referenced cells

Hi folks,

I have a spreadsheet which has dates in column A, times in column B and a numerical figure in column C.
I also have helper columns which have a figure for the start and end row for that section of data (see below)

I need to apply a Color Scale conditional format to the numerical figures across each day, for example:

DATE | TIME | FIGURE | startRow | endRow
01/06/2014 | 07:00 | 6 | 2 | 7
01/06/2014 | 08:00 | 9 | 2 | 7
01/06/2014 | 10:15 | 1 | 2 | 7
01/06/2014 | 12:00 | 0 | 2 | 7
01/06/2014 | 15:00 | 18 | 2 | 7
01/06/2014 | 19:25 | 19 | 2 | 7
02/06/2014 | 09:30 | 1 | 8 | 11
02/06/2014 | 09:40 | 6 | 8 | 11
02/06/2014 | 10:05 | 2 | 8 | 11
02/06/2014 | 10:25 | 10 | 8 | 11
03/06/2014 | 08:00 | 6 | 12 | 12
04/06/2014 | 09:00 | 42 | 13 | 13

In the above example I need the format ranging from 6 down to 19 and a new format from 8 down to 10.

I've created helper columns for the first and last row of each data set but I can't seem to use INDIRECT and the cell data in the "Applies To" section of the conditional format. Any ideas please?

The formula I'm trying is:

=INDIRECT("C"&D2):INDIRECT("C"&E2)

VBA is a possibility as there's already a lot of advanced VBA in the spreadsheet; I was just hoping to save time with a straight forward "apply the format to these cells" via INDIRECT if it's possible?

Thanks folks.