When you buy the light, as long as you don't say anything revealing, it'll be fine. That's what hydroponics stores are for. also, dont worry even if you do look suspicious... remember, its a hydroponics store, so at least one, if not all of the employees will already know what ur up to (if you look like me hehe), and probably even be doing it themselves. FYI, those lights are mainly used for growing hydroponic vegetables. I've even been able to ask my questions about growing at the store if I use vague wording and mention "tomatoes" often lol. Make sure you get an appropriate size for your space as well. If its like 3x4 Id suggest a 600watt bulb. dont make the same mistakes as me:

1. make sure you thoroughly clean and prepare your space BEFORE setting anything up; believe me, its a hell of a bitch to get done and then have to get reflective material up.

2. PREVENT LIGHT LEAK. What i mean is make sure that when its dark in your space, it STAYS dark. even an incandescent bulb can cause you problems if you leave it on for too long (like 5 mins even) when the "tomatoes" are in the dark period.

3. make sure your setup is conducive to proper care. what i mean this time is dont use a setup that you wont be able to manipulate on your own without help. luckily, i have a partner in "tomato" cultivating, so my mistake was easily fixed.

4. do plenty of research... check this out, its a link from this site to the only literature you will ever need: Marijuana Grower's Handbook there was a better link to the actual ebook, but i couldnt find it.

Other than that, I got nothing. good luck!