no, but the only help i can give you is the back of the hand under the light and raise it to a distance that dont feel uncomfortable. im sue you'll get better info soon
That's pretty much it.
Put the back of your hand under the light, move it closer until it gets uncomfortably hot, then slowly move your hand away until it's just warm, that's minimum distance.
I have a par meter but it also depends on your bulbs .. eg ipower bulb I can keep much closer than let's say my Phillips or sunmasters. I find 18-24" generally. I have adjustable wings too so if they are fully open I can go a little closer