1. The problem statement, all variables and given/known data it is a reasearch project i have to plan an experiment to find what effect different wavelengths of light, from a lamp which is used to grow plants, will have on the output of an LDR. 2. Relevant equations 3. The attempt at a solution so far my plan is (breifly) to use a lamp and put coloured filters in front of it to controll the wavelength. also i have researched a CdS cell which would be the standard lab LDR i will use. The only thing i really need help with is a proximate ranges for meters required. as i have bin looking for days and cant find anything that would help, i am using an ammeter and voltmeter to give the power output. "P=VI"