mate, why not check the spec yourself - your looking at amount of lumens per watt and red or blue spectrum thats it as far as i can see and i may only be a noob but i have done alot of research.
I have built myself a grow room that is 2.5m3 with a 600w HPS (mine is dual spectrum bulb which means it has mainly red light but there is some blue in the spectrum which means it can be used through veg also) and bathroom fans for intake/outake and cabinet for clones / bonsai mother with total 63w CFL's (2 x 20w 6500k coolwhite & 1 x 23w 2500w warmwhite) and PC fans for intake/outake all for (well in your currency) about $400 - this includes the seeds / soil / nutes / ph meter etc. basically everything.
in other words i try to buy everthing on a budget!!
sorry to waffle on but to answer your question just compare the specifications for each type of bulb - lumens per watt etc. I dont live in the states so cant check out the lowes bulbs - though i will try and check them out online and get back to you.
good luck, all i will say is at 20 bucks its probably worth trying out atleast.