I like the black light bulb effect. Enough light to see some stuff, but not overbearing. Some of our teachers leave the lights all on. I find it to be distracting. One teach did have something bad happen with a student getting sick/hurt in class, and was too freaked to ride in the dark after that. I agree with good ole Jonny G. about less light and the mind body connection . We have no windows, and glow in the dark stars on the walls with the black light bulb effect. It's kinda cool . My HRM has a light that comes on when you bring the unit to the chest strap. So, non issues to check, nice feature. Plus, our new bike computers have lights. So nice. I personally can't remember to get my computer light turned on at the start of the ride. So, I just turn it on as needed. Others turn in on at the start, and it will stay on thru out the class. It's just a pain if you are tardy, and the lights are out already in the room . Sometimes the teacher will offer to get off the bike and turn the lights on. I carry a small book light clip key chain flash light on my gym sack... so I can see my seat slider #s seatings in the dark. The rest of the bike, I can set up by Helen Keller style brail. A cell phone backlight also is enough light to see some settings if you carry it to class anyways. Hmm, tips for bad tardy people like me . Ah, schedule wise, sometimes it just doesn't work out to make it on time. Dang life stuff, must it interupt our good spin ride lol!