Table 2.

Proportion of light‐activated ventricular tissue

Percentages of light‐activated ventricular tissue at three different optrode densities (1.15, 2.30 or 4.61 cm–2).
		Optrode Density
Opsin model	Illumination duration	1.15 cm−2	2.30 cm−2	4.61 cm−2	Calculated illumination threshold
ChR2	25 ms	1.37%	2.76%	5.54%	0.08 mW mm–2
ChR2	500 ms	1.48%	2.99%	5.99%	0.07 mW mm–2
ChR2+	25 ms	2.08%	4.18%	8.47%	0.04 mW mm–2
ChR2+	500 ms	2.45%	4.94%	10.0%	0.03 mW mm–2
ChR2‐RED	25 ms	2.68%	5.64%	13.87%	0.08 mW mm–2
ChR2‐RED	500 ms	3.05%	6.47%	16.6%	0.07 mW mm–2
ChR2‐RED+	25 ms	5.35%	12.1%	34.5%	0.04 mW mm–2
ChR2‐RED+	500 ms	7.17%	17.0%	46.8%	0.03 mW mm–2

Percentages of light‐activated ventricular tissue at three different optrode densities (1.15, 2.30 or 4.61 cm^–2).